Is MDS Damaging Your HEMI? The Answer May Surprise You!

[@ReignitedAuto]

Let me know if you like this sort of video, and what system would you like to see me cover next? Thank you for watching!

[@waltergrasmick5615]

How about traction control and ABS

[@Who990]

A video on cam duration vs lift and lsa . What is higher duration vs longer duration and it’s effects on performance. High lift vs low lift , LSA adjustments , and how to determine the correct size cam for a daily driver vs a track car. Thanks

[@tomcraftdonkey2285]

How about a video on common LX car problems such as suspension and driveshafts?

[@gordonleakey6830]

I would be quite interested in seeing the hemetic. The cams removed the lefers, replaced everything replaced gone wrong. What caused it to go wrong? I believe push rods were. Put in properly left on a shelf and bent the push rots. How can this possibly happen

[@waltergrasmick5615]

@@gordonleakey6830 he has done videos about this, look back at the playlist and you can find them.

[@xxch4osxx]

Being a 2015 Ram 5.7 owner, I appreciate every video you do on these engines!

[@jeromerowland7012]

Yes me2

[@Devlins10]

I have a 15 as well. How has it been for you so far?

[@autotherapy6525]

My 15 is going strong as well 117k on the clock ​@@Devlins10

[@genxguy5275]

As a recently converted Chevy guy I'll tell you that your videos are fantastic and I've referenced them many times while repairing my 300C with a 5.7 after it dropped 2 valve seats. You're great at breaking down the system and explaining what's going with the system and why something like MDS is even there to begin with and the thinking behind the whole design. So yeah you're the best on KZbin with these modern factory Hemi engines so keep the information coming bro and thanks for the help.

[@IssaqAl-Ahmed]

Loving these deep dives. There is a ton of misinformation out there about hemis and we don't really have many ways to prove or disprove a lot of the claims. Mad respect for you taking the time to explain all of this.

[@shepherdguy]

I experienced the cam//lifter failure in my 2010 Ram 1500 in November and did the repair myself. Mine was the #5 intake that failed, which is a non-MDS lifter, so correct, the failure occurs with both MDS and Non-MDS lifters.

[@johnjlanejr]

My 14 and my dads 15 were both #5 exhause non mds lifter

[@shepherdguy]

Most of the time I hear about failures, it seems to be the intakes, but your cases show the exhaust gets affected as well.

[@stanlojewski6761]

2013 RAM had #5 failure at 130k, here, also. I can't remember if it was I or E but obviously non mds lifters. #7 was starting to go as well, rollers were getting sloppy.

[@shepherdguy]

@@stanlojewski6761 Oh, don't let John Smith see this post...he claims is only one lifter and the other 15 are always good.

[@stanlojewski6761]

@shepherdguy lol. Definitely not the case. I had one on the right bank that was "arguably" marginal, #6, I believe. The cam looked rough, as in the hard coating on the lobes were shot. Nice clean engine inside, fyi. I think it was inferior hardness and weak/small bearings in the lifter rollers that are most inferior on the older engines. I also believe that the hi volume oil pump is a major/important upgrade.

[@kevinhahn2111]

Love this entire series on the dreaded hemi lifter monster! I worked at a 5 star Chrysler dealership back in 05 when they reintroduced the charger with a hemi. I saw this on so many engines during my time there and we never really got any support from dodge on it. I have a 2019 R/T with the 5.7 so I've been eager for your content regarding this. Your research has been amazing and really appreciated! Keep up the good work!

[@bigalbranim614]

Very excited to see your visual oil pressure system!!

[@DoctorHemi]

In my 2022 Challenger R/T, to avoid the lifter/cam issue, I now try to keep an eye on when the engine goes below 1000 rpm. I avoid unnecessary idling (e.g., going through a drive-thru, or sitting parked with it idling to stay cool/warm). If I'm stuck in crawling traffic (which is rare), every minute or so, I rev it up to 1200-1500 and hold it there for a few seconds to "feed the lifters" the oil they need. Eventually, I'll swap out to the new higher flow Melling pump so I don't have to worry about it.

[@alexbush2422]

2017 1500 Big Horn owner. Thank you so much for explaining this. I've been manually disabling this system by using the manual gear button on the steering column every drive. Going to start letting it do its thing now. I've heard so many rumors of lifter failure due to this system, however, I am a strong believer that changing your oil on time, every time is the biggest help for any vehicle. Thanks!

[@0187aaron]

Same here!!

[@booostedtc]

It's better to have it off but it's a catch 22. If you have it off cant let it idle when off and idle not get oiled. Look it up idle time is a big no no

[@pisquared1366]

I must say, I still don't understand how it harms deactivating the MDS with the manual gear button. His video fails to explain properly how a deactivated solenoid starves the lifters from full oil pressure. Could you help me understand it better? In other words, a car that has no MDS (no solenoiids) he's telling us that gets less than optimum oil flow? Isn't that the same?

[@Jtwes]

@@pisquared1366 or when your in tow haul mode. That deactivates MDS and there going to starv the engine of oil when it needs it the most. ?

[@pisquared1366]

@@Jtwes exactly my point. It can't be that the solenoid at its deactivated position (that is, MDS on, lifter collapsed) alllows (through a bypass somehow) the most oil downstream. Because that's a low demand situation. I may be wrong, but I think when you're towing or have high demand from the engine and MDS gets deactivated automatically, you also have the max oil flow all throughout the lifters. I'm thinking also because it makes sense (I read it on 5th gen forum), the moment reactivation of the MDS lifters takes place, that moment you have some disruption of flow to the adjacent lifters too, maybe a condition of starvation that eventually leads to failure

[@joeperry8518]

Nice clear explanation of how the mds works, I never even thought about the need for positive cylinder pressure so the deactivated cylinders wouldn’t be trying to scavenge oil from the crankcase 🤔 Pretty cool!

[@MM_in_Havasu]

I turned off the MDS in our '14 300C 5.7 hemi about 4 years ago, using my tuner tool along with loading a hotter tune in the ECM, car returns 21-24 mpg with all 8 cylinders firing while driving at highway speeds. Works for me, have the option to turn it back on if I sell the car in the future. Mileage with MDS on was about the same, but the noise from it operating was enough to drive a person nuts, thus, good reason to turn it off IMHO. I also run a factory stock exhaust off my 6-speed Challenger, so resonance will be different in that exhaust, and it has 2.5" tubing as opposed to 2.25" stock system. I keep oil & filter changed with good synthetic oil at or around 4K miles, no crud or sludge deposits inside this engine at all. Great tutorial on this system, thanks Skye!

[@youngnolo451]

Hello. Could the noise you were experiencing with the mds active be described as vibration? Mine seems to be a vibration and I'm worried it may fail and leave me stuck or worse

[@MM_in_Havasu]

@@youngnolo451 no, noise was from the engine running on 4 cylinders in MDS mode. My new Chrysler 300C 6.4 hemi makes the same noise when in MDS but quite a bit more muted.

[@padue2503]

Hey Havasu can you send me information on the tool used is that an affordable thing I can buy or is this just for; mechanics

[@jarellanosja]

Hello parts need it to do it?

[@joenugent9638]

​@@padue2503 if you reply directly to Havasu's comment, he should get a notification and should answer your question, he'll never return to this video to read the comments unless someone replies to his comment directly

[@ghostmode718]

it was cool to see the oil gallerys thru the lifter bores. its good to get this kind of detail so i know what to expect when i build a 5.7 . Your oil testing tool will be a cool video. cant wait to see it. take it easy sir.

[@bradbyers7505]

This video is a keeper! I have a 2011 RAM with the 5.7 Hemi, automatic transmission, 2WD. I really like the truck, and I am obsessed with maintenance and reliability. This information has helped me understand the MDS system and strengthens my resolve to change the oil and filter every 3K using full synthetic oil and top-tier filters. I look forward to seeing your next video. Thanks sincerely.

[@CUnit1981]

GREAT video thank you for explaining how this system works!! I really enjoy these videos explaining how the Hemi works keep them coming. Could you potentially do an entire oiling system review on the Hemi motor? I would love to see the entire oil path...

[@jessegannon8472]

Great job explaining. I love learning the how and why about how things work. I feel like there's so much speculation in regards to the mds system and lifter failure. It's invaluable to get insight from people like you with repeated first-hand experience. Great video, love the content. Can't wait to see the oil pressure demonstration.

[@Danat-Monat]

By far the clearest and best explanation of hemi mds. Thanks for explaining it.

[@correygoffney7054]

Yes I am a student so this format appeals to me you are clear & to the point with important information.

[@stanlojewski6761]

Thank you for pointing out the "galley/gallery" difference. I was guilty of being ignorant to this fact for many years, also. Excellent video/insight!

[@blackwolfecc]

I love these style videos. Learning as much as I can about the engine in my truck. I went through a lifter failure recently, now I have a new engine. I don't want that happening again, and I wanna get another 200k miles outta my girl. These videos are incredibly helpful!

[@biffdemartino3414]

I found your explanation not only highly qualifying, but your delivery kept the topic interesting. With engine swapping becoming like a luncheon menu it is relevant to realize that the majority of horror stories of engine failure usually submit to proper maintenance "Change your oil and filter regulrly". Respectfully, Biff DeMartino

[@jamesshenay3426]

I've seen a bunch of videos on this topic, and I will say that I truly got a better understanding of this system from this video. Thanks 👍! With that being said, I currently own a 5th Gen hemi 1500 Crew cab bighorn. This is my 3rd hemi truck. I'm not a fan of waiting 7,500 miles between oil change, so I do mine at 4,000 miles, religiously and have had no issues. 2019 currently with 57k miles. Oil change is critical for any engine to run well.

[@Stone881]

Apparently you have never owned a Toyota w an 8. Oil changes every 10k miles and it looks the same as the day you put it in.

[@martinez26mm]

I like these type of videos bro. Very informative. I talk to the homies about Hemi engines sounding like an expert. Thanks 😎

[@darylwhetstone3959]

Excellent explanation of this system. You have somewhat put my anxiety to rest. I just bought a 2024 2500 RAM with with the 6.4l so I can tow a camping trailer. I will be doing frequent (5000 mile) oil changes to protect my engine from failure if possible. Thanks again for making this video.

[@amberbali8881]

I just did the same on Oct 31st.

[@scottsmith3499]

I have a 2014 Charger with the 5.7 and started commuting long distance a couple years ago, and I am thankful for the MDS because it gets me 25+ mpg at highway speeds, which makes my V-8 a legitimate commuter car. So far I have 155k miles without having any lifter failure.

[@oimpastato]

Sky, can you cover the 8HP70 transmissions, in particular the difference when running in Sport Mode via button, versus the ‘S’ position on the shifter knob? Seen many of your MDS videos, and by far appreciated explaining how not all HEMI’s come with it. Thank you!

[@angel.m9960]

Brother, I think your channel is pretty good and I'm glad that there are channels like yours, I've learned a lot from your videos and I've also put into practice many of the things you've explained and taught...! good job and may you be very successful

[@waltergrasmick5615]

Great explanation of the system. I am one of the people who have seen 23 - 24 mpg in my 08 Charger with the cruise set at 80mph on the interstate between Idaho Falls and Boise on more than one trip. We could see 16 - 17 mpg around town if we keep the road rage under control. In my RAM, especially the 10 model, it didn't do much once you get above 50 - 55. Throttle position is one of the factors for activation, and the trucks are heavy and requires more throttle at higher speed to maintain which puts it out of range. Love your videos, keep up the great informative content!

[@bobbieandianguenter6693]

Are 2019 Dodge charger also gets excellent fuel mileage.

[@JasPlun]

I have to say the 6.4l HEMI has been very good for our company and we work the dog shit out of them hauling 400 gallons of water in the bed driving all over the place on Oil Lease roads 12-14 hour days 5 days a week with lots of idling time. I stayed with 0W-40W Mobile 1 and currently sitting at 175k miles on a 2018 only problems we had were a fuel pump failure at 68k and a Radiator failure at 167k miles. I still do not hear any sounds of the Lifter roller failure yet. Out of our fleet of trucks we have lost 2 engines one to the lifter cam failure, but that truck was not serviced as it should have been and failed at 150k miles. To me the the 150k mile mark has been worth the engine performance we have gotten out of it. Had it been properly serviced like I have done to mine I believe they would make 200k. I am fixing to move into my new 2024 with a 6.4l work truck and will update it through its life time. I have learned a few things since that time from this channel that I will be doing with my new truck. Through its flaws I still think the 6.4l Hemi has been a damn good engine.

[@CedroCron]

Great video to shut down all the bad information out there!

[@Fredzep4K]

I am thankful my 2003 Ram Hemi does NOT have MDS. Now thanks to this video I know what it is! I am on my 2nd lifter failure at 279K Miles.

[@Weak_juan]

Great advice by not idling. I'd take it a step further and run 5w30 synthetic preferably redline or PUP

[@davestewart9146]

I really enjoy these kinds of videos, I appreciate your time, effort and expertise that you share with us, thank you Sir 😁👍

[@mattda13att]

this is so awesome! cant wait to see the visual oil flow system u make

[@briancarle]

Brilliant video, I’ve always wondered how this system works and if it a good thing to have. You explained it very clearly. The only thing I didn’t hear you mention is how critical is it to use the correct oil for this system to work properly. Thank you for a great video. I drive a 05 Jeep Grand Cherokee with the 5.7 and love this Jeep.

[@bearchow1929]

I've never had problems but I have a strategy to avoid them based mainly on what I've learned from your website.. I agree that shutting down the MDS deprives the system of oil under certain circumstances. My main solution is 5W-30 oil (I live in Arizona) and a zinc additive. Instead of replacing the oil pump my strategy is using an idle speed up device to take it to 1500 rpm (I see around 50 psi at that RPM) for lengthy idles I do from time to time. The last icing on the cake is I live in a rural location and can't go anywhere without at least 30 highway miles whenever I use my truck (2022 Power Wagon). And from time to time I drive in such a way as to see the eco light come on the make sure oil gets everwhere now and then. We'll see how it does, 40,000 miles as this is written. I think you have the best understanding of the problems.

[@ewconway]

Another excellent educational video. Great explanation of how MDS works 👍

[@Cleatus46]

So, leave the stock oiling system for the rocker shafts in place, install MDS block-off plugs, which I assume allow full pressure to the lifters at all times, install all non-MDS lifters, use hollow pushrods with blocked holes, as the rocker arm and lifter cups will have access to oil pressure from each end, so oil flow through the pushrods would not be necessary, and install a Melling's or Hellcat higher-flow pump.

[@300tolife8]

Learned a lot from this channel. Keep all videos coming. Appreciate your time. Definitely gonna get some merch

[@sebeku]

Very comprehensive video, thank you. For people who are not so technical, like myself, a quick hint. It's enough to change the gearbox setting in your auto mode to sport, or simply switch to sport drive mode (or track) and the MDS is off. Tried it on mine 2020 392 Challenger SC.

[@Soccerjitsu]

or tow/haul mode or go into the manual shift feature and put it on it's highest gear

[@Giniw989]

Great video! I appreciate you taking the time to explain this all🤙🏼 13:51

[@DavidSmith-tu1nd]

Very good explanation of mds system. I hope you can show a video of using a tuner to deactivate the mds.

[@owningit625]

So as a “poor man’s” mds delete, is it bad for the engine/lifters if we just drive exclusively with manual mode on the auto-stick? I’m not a fan of the factory shift logic and prefer shifting myself anyway. I am wondering if this is somehow bad for the lifters never collapsing for 4 cylinder mode? Any thoughts, please? Thanks for the amazing content!

[@FoMoCo4ever]

This is the exact question i was looking to have answered in the comments. I'll give it a bump 🤣

[@harrirauhanummi]

I have been driving this way for over 2 years. No problems so far.

[@khandsum]

Good morning, first I love your videos and thank you for educating me. I am no technician, however, your videos has given me the courage to perform tasks on my 2019 dodge charger. One question, can the cam be damaged and the lifters are not? I am getting misfiring in 3 and 5. Dodge techs could not find out what the problem is. Everything is new to the pistons. Please help. Thnx!

[@matthewperry7812]

Great video, lots of info on the MDS packed into this one.

[@Regilliwret]

Love these walk through videos. Actually seeing the parts and how they work in detail helps tremendously because I know nothing about this stuff. I am a little confused though on one thing - if MDS is off, is there any oil making it to the lifters? A lesser amount of oil? In either case, isn’t that a bad thing? I don’t know anything about engines but you’d think less oil is bad (even if the oil pump is pumping the max amount).

[@MongrelsGarage]

Great insight Sky! Lots of good information

[@rweasel801]

Thanks for another amazing video! These deep dives into how the various systems work are fantastic. I have a '17 Cahallenger Scat 6.4 manual, and just bought a '23 Ram 5.7 (gets delivered tomorrow, pretty pumped, first NEW truck) anyway, saw a video on another channel about the tick and oil viscosity. Poster claimed dodge changed the recommended oil at some point to a lower viscosity, and that going back to 5w30 from (i think) he said 0w20, fixed his tick. Did dodge change viscosity recomendations at some point? And whats your take on this? Thanks, and keep it up!

[@ragnarnorthman2673]

One of the best vids I've seen about the cam issue. I have a 6.4 scat and it had the cam problem. I will agree the car is not made to idle. It's a design flaw in the block. If you commute in a car like this sitting in rush hour traffic then you will have the cam problem. You say the MDS is well thought out. I don't agree. It's an inefficient add on because of cafe standards. With my car MDS is off in sport mode and I purchased a tuner to turn off MDS in regular drive mode. It's been 4 years since the cam was replaced and it runs like a top. The MDS would come on in 3rd gear, the motor/exhaust had a weird drone and you have to punch the gas pedal to get out of it. I get 1 to 2 mpg better on highway without MDS. It cost 6 grand to replace the cam then. I can only image what it costs today.

[@pkgorday]

Thank you. You fit a lot of information in a short concise video.

[@ChrisWilliams-fs1zp]

Yeah. Say what you want but I work in an independent shop so I service all brands domestic and import. We replace DOD and MDS engines 10-1 compared to the standard v8 versions of the exact same engines. Oil consumption is a huge issue on these engines also compared to the standard models. Great videos btw. Very informative

[@charlesrobbinssr7270]

I just got a 2024 RAM Hemi. This Vid really makes sense of the MDS system , the RAM system is really not that cumbersome and it's generally smooth. Now our Subaru Stop /Start is a shit show but after watching this vid I'm letting it do it's thing. Thank You, good stuff.!!!

[@timmorton6049]

I have always enjoyed the content that you put out, Thank you sir and I have learned so much from you. Thank you.

[@socal33]

I just shared your video with a friend who has the same Ram 1500 I do and think that turning of MDS will prevent future problems.

[@eyemright]

I skimmed through the comments but didn't see anything related to the exhaust manifolds leaking. It is pretty coincidental that the exhaust bolts started breaking in the 4th Gen Rams when MDS was introduced. Then Ram beefed up the bolts for the 5th Gen Hemi Rams, which then only moved the problem to the manifolds cracking, which are now the week point. Many suspect that the MDS causes the exhaust temperatures from the "disabled cylinders" to be cooler than the exhaust from the "active cylinders", which causes uneven heating of the manifolds. These exhaust leaks started when MDS was introduced.

[@bornfree3124]

I have 04 Ram 5.7l no mds, my passenger side back 2 exhaust bolts broke, i also have 07 durango 5.7l, my 2 bolts broke on passenger side back same as my non mds, i hear the aluminum heads heat and cool at different rate than the iron manifolds do which causes the bolts to break.

[@jewelleryaddict]

I have a 2006 Chrysler 300c hemi 5.7. Have had for 17 years and have had no problem. I think it's good idea. When I step on it for some fun I know I have some real power and never have had a problem.

[@gpaje]

I am curious that if the MDS system improves lubrication and good that it remain on, why does the Tow/Haul setting prevent MDS operation? You would think that at a time when the engine needs the most lubrication, that it should remain functioning? Many times when steady cruising on the highway that MDS can turn on while towing but won't due to being in Tow/Haul mode.

[@Mackaroni_510]

Great question. I'm also wondering if MDS improves oil lubrication, when cold starting the engine allegedly the lifter bores are not getting proper oil lubrication or when you're WOT when oil flow I'd moat important because MDS is not activated during these times

[@Geoffreyblunts]

Well if its cutting off half the engine... pretty sure its not giving more oiling when on. That being said my oil psi stays above 50 when driving or when mds kicks on

[@Soccerjitsu]

exactly, something must be wrong here, why would it deliver more oil when only half the cylinders are firing?

[@bobbieandianguenter6693]

So far it works great in our 2019 Dodge charger. Great video with a lot of very interesting information.

[@MongrelsGarage]

Before watching I will say “No” MDS does not damage your engine! Looking forward to seeing what you have to say on it though

[@wendellrivers853]

This guy is awesome , which i could take my Hemi to him personally to have him work on it 😂

[@jasonthorpe76]

Great video! I currently have an issue with a multiple cylinder misfire. History is: 172k miles. I did a cam and lifter job complete with heplcat oil pump about 6 months ago but it’s not a daily driver bc it’s a truck for my son. The multiple misfire issue only happens when we get up to speed and stop at the 4 way stop in our small town. Shut the truck off and it’s ok again. I’m thinking either the solenoids or a terminal on the solenoid plug. Your opinion on wear to start spending money to correct this issue would be priceless and could save me a ton of time and money. Thanks in advance!

[@mike-yp1uk]

I'm always looking for more useful info. Great explanation

[@ReignitedAuto]

Thanks for watching!

[@barbarafleece377]

Very good video. Thanks so much for the educational content. Could you do a video on why you think the 5.7 and 6.2 Hemi’s seem to be prone to dropping valve seats? GM also has an issue with that on their 6.2 V8’s. I would love to hear your take on that issue.

[@mypronouniswtf5559]

Dropping valve seat is a 2008 and older Hemi issue,not an issue on 2009 and up..

[@TypeEF118]

Thanks. Having some relation to ECM tuning, I can't even count how many times I've been hearing that sad-sad story about the MDS killing the engine. No, sir, It's absolutely not you using cheap engine oil and extending the oil change intervals, it's the dumb MDS. But here finally is a video that I can share, just to explain the whole thing. Thanks again! My 2c - I personally think that what could really improve MDS operation is increasing the torque output of the engine. We're talking about N/A street daily driver engines, so no forced induction here - but a good AFR in all modes and some nice and smooth spark maps with more advance definitely help. Factory Ram tune is quite conservative to make it operable on low-octane fuel, but if the owner is ready to forget about the low-octane forever - then we can get more torque and efficiency out of the engine without sacrificing the mileage or the lifetime. And it would work for both V8 and V4 modes. Sadly, the well-known calibration editor for Dodge kind of lacks in terms of accesible MDS-related parameters. I've seen and experienced the same effect on GM trucks, 3rd gen Tahoes and Escalades mostly. Proper tune for a stock engine is a world of difference, and the AFM/DoD, which is GM's name for variable displacement system, really helps save some fuel on the long highway trips and moderate throttle city drives. Anyway, this has been a great video and definitely looking forward to the actual work demonstration that you've mentioned. Keep up this awesome channel!

[@603photog]

Fantastic video! Thank you for this. I am currently rebuilding my 5.7 out of my 2012 Ram 1500 Big Horn with 185,000 miles. Why am I rebuilding? Because I ignored my lifter tick for too long and completely lost cylinders 7 and 3 due to my thoroughly trashed cam. Guess which of those two cylinders has nothing to do with the MDS system??? So, yes, I can confirm that the MDS likely has nothing to do with the lifter failure. However, I do not really have a high amount of idle time on the truck so my failure is definitely due to either poor oil pump performance OR some kind of debris decreased oil flow to the top.

[@MorganMcGinnis]

im not supposed to be here.... lol.... i have a Gen 1 HEMI.... with MSD...... i clicked to find out what MDS is, so, thank you :) Neat!!

[@ReignitedAuto]

Appreciate you watching!

[@bdo9114]

Best explanation I have heard.

[@JimSix-jo6hf]

this was really good, I just did a cam replacement on a 5.7 in a ram pickup, had 2 bad rollers one was an mds lifter the other was a regular lifter I think the problem is the bearings in the rollers just like the 3.6 V6

[@miragefd]

Would enabling a high idle function do the same thing if your sitting in your vehicle for a while? Emergency vehicles idle very often and municipalities don't want to pay alot for modifications

[@jwhmerica504]

I’ve been asking that for a while. My 20 1500 idles at 550 hot and sits around 31 psi. I’m in the mid 40s if I use my foot and get it around 650 rpm.

[@bjayscanlon]

Having just purchased a 2023 RAM 1500 classic (before they go bye bye) I appreciate this insight very much. I do have to decide on which oil to use, maybe Royal Purple or Penzoil high performance. I'll keep the MDS until I need to get into the engine. TKS!

[@ReignitedAuto]

That's a great choice of vehicle. I like the classic version myself, and those trucks are very well sorted. We rarely see too many serious issues with them.

[@CoryPhillips-406]

Thanks for a great video! really informative, especially the part about the oil flow. I wonder if those galleries are just the engineering solution of how to activate a mechanism on a push rod inside the engine and not truly for lubrication. I feel like it would be a fatal flaw to have a oil flow that would be limited whenever the truck is towing or running hard (when MDS is off naturally).

[@ReignitedAuto]

I do think it was an interesting decision to do it the way that they did, but I'm not an engineer myself...

[@danjoe22]

Great video, clear explanation, you know your stuff. I have the MDS on my 2015 300C and I love it. I am a conservative driver and when I take my car on the road I can get between 27 and 30 mpg. You said you have not seen numbers like 24 mpg before. Am I not to believe my trip summary?

[@ReignitedAuto]

I can believe 27- 30 would be a stretch though. I just generally don't see numbers that high because I'm not very conservative 😄

[@Vadim_Andr.]

you should see your numbers from refueling to refueling in the receipt at pump and on the speedometer and divide

[@snowman440]

What an awesome explanation 👍🏻 great video bro 😎

[@Tumbleweed_Tx]

in my case, it was a non-MDS lifter that failed, on cylinder number 5. Mine was due to previous owners who should have earned the car a salvage title who never ever did maintenance work on the car. When I changed the oil filter, it was 2 years old.

[@juanm.ramirez7878]

Very well explained...i think i can live with that rumble..

[@MissionaryForMexico]

The preventative maintenance is change oil and filter and shorter intervals. Use only synthetic oil.

[@lawrencecastillojr7535]

Cooling system upgrades. 180 degree thermostat, larger radiator. Transmission cooler. Things to keep the engi e cooler and in the performance band in the South during summer. We don't really have a winter.

[@inlegionnaire2786]

Question as someone who’s been pretty involved researching this same topic: You mention tuning off only can cause issues that the MDS cylinders will not get adequate oiling when their lifters are no longer fully in use (I’m paraphrasing, I know I’m not quoting 100%). If that is the case, wouldn’t running WOT, or in manual mode, also then be bad? Why would running all 8 tuned off then be worse? I’ve had my 6.4L Challenger coming up on 5 years now, 101k miles, and majority of those I’ve ran with the MDS on. I drive many long trips and the benefits have been noticeable. But on occasion I will tune off, for the smoothness of just running on 8 all the time. And with my Solo exhaust now it just sounds far better always being in V8, as it’s very jerky due to the “noise” change as it switches to V4, it sounds very lugged for a second. And it will vibrate a bit. I do know this is due to my own exhaust, not totally the MDS’s fault.

[@toecutter1547]

I have the good ol gas guzzling Ram 6.4 Hemi. I have found that turning the system OFF is the best way to go about it. I saw minimal half mile a gallon difference at best keeping it MDS on and worse mpg pulling a trailer.

[@66balsam]

2015 Ram short box/ reg cab. Hemi with no issues at 195,000 kms. Do my own synthetic oil changes. Best highway run last summer pulled 25 mpg, pretty good. Truck has catch can and muffler delete, MDS not a problem or issue for me.

[@richmitchell734]

When we first bought ours I hit 30 mpg at highway speed (cruise set at 65). Sweet!

[@domd336]

Thx for information another sight said To put it in track mode and keep MDS off. 😢apparently what your saying it’s bad for engine. I’ve been doing this for a month on my SRT. Thx for sharing

[@tomcooper920]

I don't like the fact that all manufacturers have issues. In order to reach the standards they need to I feel that they are moving away from the set ups that work really well. Back in the '80s some of this stuff was tried and it failed. Now we are still trying to get it to work right.

[@ReignitedAuto]

I'd have to agree. The fact that the government keeps moving the goal posts in regards to how vehicle must perform means they are constantly redesigning systems trying to meet these standards, only to have to completely change them again a few years later. It means there's not enough development time in each platform to correct the issues before they have to clean sheet another design that then has its own problems. And the cycle repeats over and over. 🙄

[@darthmaul7428]

My 2016 5.7 ram just rolled 142k since new I have always used the gear down and put in 8 and that keeps the eco mode off. I never run it in eco mode. I average 18 to 20 mpg. I also have a catch can, intake and exhaust. Put a can of sea foam in the gas once a month and change oil spring and fall sometimes in the summer too. Not 1 issue knock on wood.

[@URGOVTNAME]

I personally didnt see any problem with turning off my mds on my 06 300. Had it turned off for about 2 years before i got it cammed and deleted. Cam had no wear and the lifters looked just fine too.

[@VchaosTheoryV]

It's wild to see how complex these systems are. It boggles my mind how the engineers over decades could figure this out.

[@h.d.mech.mortenson2098]

Great video. What do you think about people switching the engine oil weight to 5w30 ? Thanks.

[@thereare4lights137]

How about those of us that want to keep the MDS working, but still want a bit more cam for some power gains? Any options there, or are we basically stuck in an "either/or" type situation.

[@Bophadeez1]

Great work man, keep it up! Can you do a video on replacing the power steering pump on a 06-10 Charger? Or if you've done one already link it for me!?

[@bedvyr]

Awesome, I've been waiting for this one. TY!

[@NickDelicious-zz6it]

Great video for new comers like myself

[@MacGiollaCostigan]

I just bought a used 2016 Ram with 113k miles runs great it's in excellent condition i knew nothing about this mds or cam issue first time owning a Dodge always been a Ford owner. I noticed it has the cold start tick and goes away after about 30 seconds warming up. I ran it with the mds off for about 500 highway miles and noticed that it had a much weaker start like it wouldn't fire up as strong so then i watched this video thinking maybe not running the mds the way it's intended is not a good idea you explained that very well i appreciate it. I was getting about 17mpg with mds off and now 18 with mds eco mode active. It starts up much stronger too the way it should.

[@MattSchmader]

Great video, do you think the changes in 2022 Ram made to a thinner oil is to help prevent the lifter failure? Or is it just to chase better mpg?

[@Jtwes]

So if deactivating the MDS by using your transmission auto select 8/8 is hurting the oiling how do they get around tow/haul deactivating MDS and that’s when you need the most oil for towing . It’s towing when you have arguably the highest oil temps and there going to starv the oil to the engine. ?

[@ReignitedAuto]

On a temporary basis like that there's no problem, I'm more talking about people who turn it off every single time they drive the vehicle. Also it's far more important to make sure your oil changes are being done at the proper intervals and that you're not idling it excessively. Both of these things will affect your engine far more than the MDS system.

[@Jtwes]

@@ReignitedAuto Im unfortunately that guy. Lol 😂 I bought a 2500 6.4 2022 model crew cab 4x4 brand new and it now has 40k on it and I have never let the truck run in MDS mode. Having said that I’m not saying you’re wrong by no means . My way of thinking was if the solenoids turn off oil or limit oil to a lifter when MDs turns on then turning it off should give me full flow. I’m about half way through a year long test I’m doing with lake speed Jr on testing Pennzoil in the truck versus Amsoil signature series to see which oil the engine likes better and so far both have outstanding wear numbers albeit the copper is a little high in both oils . I will say I’ve never went over 5k on an oil change since I’ve had the truck.

[@ChevySS1968]

I recently bought HPTuners MPVI3 dongle and a new unlocked Dodge PCM. The very first thing I 'wanted' to do was to "Disable" MDS in the tune, which is very easy now, but I haven't done it. I totally get the point being made by you here.... i.e., the auto manufacturers seem to do some stupid things, but would they be so remiss as to allow MDS-off condition to starve oil to ANY part of the engine?? As you say, in a towing situation this would almost certainly be quickly disastrous. I just hate the MDS in my 2019 RAM 1500 5.7L, it chugs and feels like crap.

[@ReignitedAuto]

@@ChevySS1968 i do want to clarify again that the lifters are not being starved of oil when the system is off. There is still oil flow, it's just that there's more when the system is active.

[@motopilot74]

Great video! Keep them coming.

[@GarcBomber]

I left MDS solenoids installed and plugged in with Big Cam/heads/VVT limited and non-MDS lifters. Not necessary to remove and plug, in fact it’ll limit corrosion on the receptacles. 😊 obviously the tune is the dictator

[@jamessackett7431]

I have a lot of photographs. My ram fifteen hundred getting twenty miles a gallon. I spent a lot of time commuting from Michigan to Buffalo via Canada. Where the speed limits are a lot slower than in the US. Cruise control on sixty miles an hour

[@jjfoster667]

Good video overall. The only thing that threw me off is the fact that you said its worse to hit your tow/haul button every time you drive to deactivate the MDS for lubrication issues. In essence, if that was true, whats the sense of having the MDS if your a person that hauls alot or you live in a hilly area like me and the MDS is barely being used even if I have it on. Just a bit confused on that comment. So if someone buys a Ram truck to do alot of pulling or hauling, you should not get one with the MDS cause you'll have issues down the road due to lubrication? Thats what I'm picking up off of that comment. All the lifters better be getting the same lubrication at all times with or without the MDS system on. If not, thats a poor design in my opinion.

[@bornfree3124]

Good point, also you would need all the lubrication you can when hauling do to working the engine harder..

[@ChevySS1968]

Totally concur. I find it near impossible to believe any oiling reduction would be caused with MDS off.

[@camsmith7006]

This was a fantastic video. I am new Ram 1500 owner. 2016

[@donaldgunnell1073]

That was very informative, thank you once again, your videos are awesome 👍😎.

[@KeithBickford]

When I'm cruising on the highway at 60 in my Rubicon 392, fully loaded with well over 800 pounds, I've been seeing 21 mpg on a 250 mile trip over a pass in Utah. My Jeep has a light that tells me when MDS is active (4 CYL). But I don't need to see the light to know it is on. I can feel it in my seat. The engine (or exhaust) vibrates when MDS is active.

[@blueduster74]

My experience processing warranty parts, the vast majority of failures are wrong oil used and not changing oil often enough. I get to see the service write ups. But the MDS lifters do fail far more often than the non mds.