The real reason why you should let your diesel idle before shutoff

[@darkirondiesel]

SHOP MERCH HERE darkirondiesel.com

[@IndustMachWerksofTX]

I learned this 30 years ago, but instead of letting the truck idle, I start to go really slow when I’m getting close to my destination and parking. Keep the rpm under 1,000 and let everything cool down as I’m driving. My one truck has 340k miles on same turbo and still works great.

[@BrodieBr0]

Exactly this! Great tip here and in the video. 👍

[@rob45x]

I do the same. 5 mins from the destination I just cruise it and I might idle for 30 seconds max.

[@CollinWeis]

This is what I do with my Ecoboost

[@strattuner]

the second law of thermo dynamics says[ heat runs to the absence of heat],in other words you come off the road hot,and do not cool the turbo housing down to under 400 you are cooking the turbo seals,coking big times,those turbos run real high rpm and they need to coast down and run cooler till shut off in good weather,its the nature of the design,its a diesel thing and nothing will change it,and everyone knows it wastes fuel,but everyone also knows that diesel fuel should be 79 cents a gallon,forever,ALL TRUCKS GOTTA RUN,THEY HAVE SOME WHERE TO BE,AND they are always late

[@SurFrankenRon]

Haha I do the same shit. Hammer it on the freeway and cruise real easy for 10 minutes after the exit

[@garydotson2277]

As a retired mechanic, I fully agree with this advice. Thanks for posting this.

[@darkirondiesel]

Thanks for the comment!

[@codyhardman8610]

Thank you, New Diesel owner here I've never heard of this before . Thank you for your time and explanation

[@Tallnerdyguy]

Same here, just glad i have been sitting finishing my show or song before i get out...

[@Bloodbain88]

I let a buddy borrow my 12 valve to haul a trailer out of state. I told him to let it idle for a minute before he shut the engine off, especially after getting off the highway, hauling heavy. The first time I started the engine after he gave it back I could hear exhaust gas rushing out of a giant crack in the manifold.... Yeah, he shut her right off at a rest stop. Told me he heard a loud "PING" as he walked away.

[@chasonsimpson4409]

I always watch my oil temp. I only shut the truck off after temps drop by at least a few degrees below driving temps, sometimes more. I learned about this over 20 years ago, all turbo charged vehicles benefit from this practice. Glad to see you explain this so more people know!

[@AgentOffice]

What about my diesel Jetta

[@chasonsimpson4409]

@@AgentOffice Any turbo charged vehicle! I used to have a GSX Eclipse (turbo charged AWD). I installed a turbo timer on that car, which worked off of pre-programmed variables to set an appropriate cool down period. This allowed me to turn the key off and remove it from the ignition, this allowed me to lock the car up and walk away from it. After cool down the car would shut off on its own.

[@TreebeardNL]

You do need an oil temp gauge for that 🥲

[@chasonsimpson4409]

@@TreebeardNL That is true, so five minute rule might work out. Or while not super accurate, coolant gauge going down in temp might be a little indicator of overall engine temp

[@billdurant3560]

@@chasonsimpson4409 saw this on a 1965 KW way back in the 70's

[@brettelmerelmer3061]

When I was a kid on a farm (mid 70's), the farmer I was working for added turbos to all of his diesels, and he told me the reason we had to idle 'em for 5 minutes before shutting them off was that we were working the equipment so hard and the exhaust rotors were so hot, that the rotors would crystallize as they cooled, and next time you started up, the vanes on the rotor would shatter and go right out the exhaust. As expensive as turbos were back then, it would have taken three months for me to earn enough to pay for one turbo, and I didn't want to go hungry that long.

[@kfelix2934]

not even remotely likely to happen as what you described. These turbine can go upwards to 2400 farenheit. The vanes are not going to shatter or crystalize.

[@nolanbollenbacher609]

@@kfelix2934 notice how he is saying how the farmer told him and that he was a kid so he may have not know how turbos work and when your working for someone else using their equipment it is respectful to operate it how they want you to and he was a kid so if he were to break it like he said he wouldn’t want to have to pay him off for the next 3 months

[@jordanwicinski2141]

@@nolanbollenbacher609 and it was the 70's!

[@david.bowerman]

This is actually good info for any engine with a turbo. If you have been running under a sustained load, give it time to cool down some before shutting it down.

[@NickBeek]

I use a EGT probe in the exhaust just after the turbo coupled to my Edge CTS turbo timer. Since I've always read that oil begins to coke at 400f degrees I have the turbo timer set to shut it down at 360f. You would be very surprised how long it takes to cool down at a rest stop after pulling my camper through the rolling foot hills in my area during the summer. The owners manual for my Cummins powered Ram says 5 minutes of cool down is good after pulling heavy loads under harsh conditions. I have found it takes upwards of 10 minutes to get back down to 360 under those conditions.

[@ryonbrand7885]

Before my ‘98 Jetta got rear ended, I used to let it idle until the EGT got down to around 240-250 Fahrenheit with my probe before the turbo, a bit overkill, but I didn’t have the money for a new turbo, so I did everything possible to keep it happy, I’d even do my oil changes 500 miles earlier than recommended, beat it once in a while to keep everything cleaned out, that TDI always ran good. The mods done to it included a set of larger injector nozzles, an 11mm injection pump off an automatic car, a cheap cone filter from Auto Zone, an EGT gauge, and an unrestricted boost gauge that resulted in an 18 psi boost spike for a short period of time. The car had a euro headlight switch, a rear fog light, LED headlights, and some sticky tires, it was a good little beater, I stuck with a Cobalt SS on a twisty road with it once, thing cornered like it was on rails, and had hilarious body roll while doing it.

[@svridr2k]

I use synthetic oil as it is more resistant to burning and always idle it to 400 deg EGT or lower before shutting down. Great video!

[@darkirondiesel]

Yes another good reason to use synthetic!

[@drizler]

Synthetic always. It’s cheap at Wallymart!

[@FlatPlaneCranky]

We use Peterbilt 389 with the 565 X15 Cummins and pull 129,000 gross here in the mountains of Nevada. We cool down by watching the oil temp and won’t shut down until oil temp gets below 200 degrees. We turn the engine fan on and idle at 850 rpm then let the factory idle finish it off. Never a problem. Amsoil Oil samples always show that we can extend oil drain intervals but we change at Cummins recommended 25,000 miles because we run in extreme conditions.

[@zstang01]

Just bought my first diesel for work never had one before so thank you for this video man.

[@darkirondiesel]

No problem 👍

[@nyenergytrader]

Yo man, this is really helpful. When I got in the business of Hollyn six years ago I started watching KZbin videos, and you were one of the first ones I subscribed to. Now I’ve go 1,400,000 miles on my 16 ram and this beast does not stop running, I just replaced the motor or rebuilt it I should say at 1,350,000 miles and the motor was in great shape, just the ECM crapped out and told the truck to over fuel the cylinder and that’s what blew the piston. But all of these great videos for how to maintain your truck will really make it last, and I will likely sell my truck at 2,000,000 miles if I’m still alive after all of this. Thanks for all this great context. I wanted you to know how much it has really helped, and how much I’ve saved I’m doing a lot of this work myself.. keep it coming

[@darkirondiesel]

Thanks for the comment man! That’s why I do it, to entertain and educate! Glad you enjoy the videos

[@timgreen4137]

I just had the turbo rebuilt on my 12.7 Detroit after 1.3 million miles. I had it rebuilt out of caution, because of so many miles. I run synthetic oil, with a centrifuge bypass system. I always let the truck idle after coming off the road for 5-10 minutes. The shop said there was no unusual wear. The bearings were still in good shape.

[@blendpinexus1416]

never a bad idea to use some caution.

[@giggiddy]

I always like the real life testimonials. 1.3 million on a turbo with no discernable wear on teardown is proof to me that your theory works.

[@vwkaferman]

I learned about this back in the mid 90’s when I was in the military. I’ll never forget letting our M35 Deuce idle at a gas station after a haul and letting it idle for a few minutes. I think I got a letter of council on that one (was told to shut it down) because I argued with a superior haha. Yeah, Deuce, probably didn’t matter but hey I tried!

[@MegaGeorge1948]

In addition: using synthetic oil can help too. Because it has a higher heat resistance to boiling and coking.

[@darkirondiesel]

Yes another great tip. I thought I mentioned that in the video but maybe I forgot.

[@willdrivesu7914]

Damn, good to know since I recently purchased a truck with a diesel in it, thanks for this information.

[@Montyhugo]

In the late 80S I was driving L9000 dump trucks in Alaska and the mechanics put turbo chargers on two of trucks, they made sure too remind us too let it cool down when parking them! They actually asked us to let them idle for at least 10 minutes.👍

[@aaronkeiser6349]

I usually drive my truck until the EGT gauge says max (about 1500 degrees) then I immediately shut it off to store the heat for later for better cold starts. Works like a charm. I've done this for about ten years and well over a million miles and she still runs like a top. MINT👌

[@darkirondiesel]

Yessss this is key for those tough winter mornings 😆

[@greiner7414]

Peg? Is that you?

[@aaronkeiser6349]

@@greiner7414 Did I mention I use Cosby sauce to get er goin???

[@ericelsberry5585]

Only if it is a ferd or a cat. Shopping crates don’t matter.

[@laseidjackson4542]

I really like to idle my 6.7 high up to 2 grand then shut it off suddenly so that I can store up unused rpm's. I'm over 300k too.

[@stevenm.hollis4429]

Thanks, Kyle! Great advice! My truck will be out bread and butter in the next few weeks - need to do whatever we can to keep our truck running it’s best. Nothing like a strong running diesel! Cheers!

[@99unclebob]

Great video Kyle, I was taught this back in the late 70's early 80's right up to present day all these years in the auto and commercial vehicle industry, this is relevant to gas and diesel engines, I heard this from engineers who worked for Cummins, Cat, Detroit, Komatsu, Benz, and Volvo the difference it made putting this into practice showed on data that all these companies collected for over 10 years was longevity bias much as another 250k kilometres or more income cases, When i worked for Volvo Canada in the early 80's when they introduced turbo charging in their car engines they were only oil cooled and were really stoutly built and tested, only to find customers weren't properly educated by dealers on this few minute procedure and were replacing turbos under warranty in the several thousands in the first 2 years, once the owner got their vehicles back they were then taught how to properly do this and virtually had no comebacks here in Canada and in year 3 of these engines they introduced the water jacket along with the oil built into the turbo housing and actually improved performance in the car and even aa slight improvement in fuel economy, 2 mpg, then they brought out the intercooler option in late 1983 /84 for a $1000.00 and boy it made a nice change from 130bhp and 145 Torque to 162 bhp and 186 Torque there were fun to drive, and allot of customers were getting speeding tickets, the price of having fun 😎

[@darkirondiesel]

Amazing how much difference it makes when you actually educate someone on something

[@ur_a_buS]

The same goes for some turbine engines. Simple rc jet engines like jet cats also recommend to idle or idle at 3-5% throttle for a little before shut down so it allows the hot turbine to cool off as low as possible before shutdown. The bearings are lubricated by a total loss fuel/oil system, oil is mixed into the fuel and fed through the bearings for lubrication. Newer rc jet engines have a nice feature to help with this, it kicks in the starter to keep the turbine spinning at 1krpm until egt decreases to 100C. Super cool!

[@frootloops1655]

The full size Boeing 717 has a blue indicator light that comes on when the turbine engines have cooled sufficiently after landing. Wasn't usually a factor at the major airports with long taxi times to the gate. But at small city airports with short, quick taxi's to the gate we usually had to wait at the gate a couple minutes before shutting down.

[@DirectCurrent4u]

Just turned over 170,000 miles on my 05 Cummins.I alway try to let my Cummins idle does until the EGTs get to under 300 degrees.I never really thought about the oil in the Turbo being that hot.It totally make sense. Thanks for the info Kyle! It really helps. Keep up the great work and thanks for sharing.😎👍

[@darkirondiesel]

Thanks for watching!

[@panzerveps]

This applies on all engines with forced induction. You can reduce the problem somewhat with a water cooled turbo with an electric water pump that runs for a while after engine shut off.

[@digilyd]

Pistons and valves and valvetrain get hot also on combustion engines with natural ventilation. And are cooled by the circulating engine oil.

[@VinceB391]

Thanks Kyle. Glad you made this video. I’d heard about it but never gotten an explanation.

[@dx80cruiser46]

Or just a add a turbo timer, it idles the car for a set time before shutting it down. Was popular with back in the day. The best way is to gently drive the car for the last few kms before you get to your destination

[@concernedpatriot.2221]

Wow. I had no idea. I drive a 2017 F-350 and also have an RV with a 8.9 liter Cummings, great info. Thank you.

[@BillinSD]

Now with all the trucks and cars coming with turbos, a whole new generation of people are going to learn this the hard way. Sadly manufacturers don't add the temperature monitoring necessary to alleviate the problem. I was introduced to "turbo timers" in the 90s on cars in Japan - you lock your car up, walk away, and it idles for a set time and shuts itself off to allow the turbo to cool.

[@razer2981]

Good lesson for all turbos. I had Mustang SVO. Shortly after I bought it, I was told all the same stuff. For all the same reasons.

[@wesleybussey]

I believe this is also a manufacturer recommendation by Cummins, Cat and even large industrial diesel generators recommend this.

[@robertboykin1828]

ALSO, the bearing has two seals, one on the exhaust side and one on the intake side. If the one on the intake side ruptures, you got a runaway engine that you ain't got a chance to stop unless there is an air shutoff handle.

[@darkirondiesel]

Very good point

[@frootloops1655]

Not trying to be a wise guy. But if you blocked the exhaust pipe with something would that shut down the engine?

[@waynewicks5349]

And most people don't realize this and drive the turbos hard and shut it off that's never good always let it idle good video

[@dshudson]

I'm glad I watched this, I've been ripping my 3500 Cummins Dually up my street, which is a long pretty big hill, then pulling in my driveway and shutting it off. Not to mention I have it tunned and set of the highest level. I guess I'll stop driving like a dick, it's just fun, the truck drivers like a Corvette I can't help it.

[@SUBI_PaT]

Thank you Kyle for this video definitely learned something new I have always heard the truckers say let it idle but didn’t really no what they meant but this video explained it an happy you made the video thank you again Kyle.

[@tylersearle9041]

Was always taught to let engines idle a bit before shut down, even the old big cubic inch gas engines in trucks. Was told that the engines need to cool down to prevent hot spots. Always let my 2001 Dodge Cummins cool for 3 minutes before shutting off and cringe when I see others just shut down when they’re hot.

[@owenheussner4936]

Yes spot on I’m 16 and learned this in the farm very good advice

[@crudedriver]

Being raised on a farm I learned to let a diesel cool down in the 60's even if it didn't have a turbo on it.

[@dethangelishere394]

1) the military says idle for 5 minutes. and 2) that "residue as you call it is oil carbon. molecularly, oil carbon molecules are sharp and it eventually cut the seals out of the turbo causing oil to pump into the exhaust, or the intake to be digested by the engine. neither are good options. this is why you dont want your oil to coke on the turbine shaft. if you look on youtube, you will find diesel engines that are "runaway". the reason this happens is because the seal of the intake side of the turbo shaft is leaking so bad that it is pumping oil into the engine and burning. the engines cant be shut off. they run until they run out of oil in the oil pan then they seize. hope you read this.

[@JaxoEye]

Your turbo spins after the engine is shut off and the oil pump is not pumping oil to the turbo bearing, thus no lubrication.. You can install a "turbo protector", which is a reservoir with oil that gravity feed the turbo after the engine is off.

[@carl2591]

I have a EGT sensor in the driver side exhaust manifold and when running i see temps with no trailer in the 500-7-800 range. When pulling RV the EGT can get up over 1100 degrees if pulling a grade etc.. I find when coming into like a rest stop you are not really on the fuel from the time you get in the exit lane and get around to the parking area.. When i look at the temp gauge by then now some 15-45 seconds or so and you are moving the whole time the exhaust temps get down to 400 degrees pretty quick. I still let it idle for another 15 to 20 seconds or so if i see the temp still above 400.. the turbo temp goes down quick as well during this time with the air flow through the front.. 2003 ford with 7.3L diesel and have not had any issues with oil other than the usual from older not so clean burning diesel engine. good info for sure.. thanks..

[@vanhasydan4754]

Idling the engine going for any turbo engine, not just diesels. I've had to teplace the turbo on a performance sedan i had years back do to coking. And your right about the exhaust heat. I've seen manifolds crack, especially in cold weather after being shut down immediately on parking.

[@yonmoore]

The explanation and understanding helps to motivate me to pay attention!

[@michaelwalters7110]

Thank you for the lesson. Easy to understand information is hard to find. You nailed it and the lesson has been learned.

[@MyWerttrew]

If you lose all your coolant on a hot engine that is under load it is a good idea to start the engine for a few seconds at a time every minute or so till the engine has cooled down. This allows the oil to circulate and prevents oil coking in the turbo.

[@weepweep2225]

My Ram owners manual gives me idle times for different situations. I run my truck light so I usually idle for a minute or 2 before shutting her off. Thanks for the video man

[@Eric2300jeep]

Yes, yes YES! I don't recall when exactly I learned about letting a turbo vehicle equalize the turbo to engine temp but, I've always practiced and preached it. A pyrometer (EGT probe) is a MUST have for any turbo vehicle, especially tow rigs! My '03 Cummins is just about to roll over 300,000 miles and that factory Holset still builds boost quickly and efficiently! Still gets 16-17mpg towing a 4,000lb car on a 2,500lb trailer. My buddies who tow with gassers just shake their heads in disbelief when I show them my fuel bills after a long haul 😂

[@darkirondiesel]

Haha Towing with a gas engine is awful

[@wizard_of_poz4413]

All the gasholes I talk to try to blow smoke all the time about how dumb anyone who buys diesel is and they get 16mpg towing a camper or gooseneck and that gas is always 6 dollars a gallon cheaper at bare minimum and they can change their oil for 10 dollars, or some other bs copes they come up with

[@milesparris4045]

I know a guy who drives really hard all the time, then stops and shuts it off. I can hear his turbo still spinning for half a minute. He also starts it up, drops it into drive and takes off before the starter stops spinning. I've told him a couple times that this is probably why he has to buy a new truck every two years because of maintenance and warranty issues, but he doesn't listen.

[@Tallnerdyguy]

Thats the jerk that when you buy a used truck, is somehow trashed at 50k miles :(

[@ellobo1326]

My LS tractor has turbo. It says in owners manual and a sticker on the dash to cool down at 1000 rpm for 2 minutes after use. I always do that. Now I understand why. Thanks for the education !

[@marcelogouveia9614]

Great advice buddy, I do the same on my Toyota Bandeirante down here in Brazil.

[@WildFaith]

Pretty good explanation. The real issue is the RPM that the turbo achieves during extended time in boost. It takes time for that free spinning turbo to come to a stop. If you turn off the engine you also stop the oil pump and therefore you have a turbo shaft, bearings, etc spinning with no oil being fed. I have seen hot side bearing failures from those who do not have a turbo timer or manually idle down there trucks. I will say this is mostly when towing or getting directly off the highway after a while in boost. Not really needed if you just drove around town.

[@redline9536]

I disagree. The issue is heat. If rpm was the issue. Shifting would be an issue.

[@weareallbeingwatched4602]

They could totally run a cool down shutoff sequence these days.

[@davidthompson7817]

@@redline9536 I agree with you and why risk your engine are you in that much of a hurry to run your equipment?

[@montejones5788]

When I certified on Powerstroke diesels a number of years ago the rule of thumb for idle after working the truck was 5 minutes 4 unloaded vehicle running highway speeds for extended length of time. 10 minutes for a loaded truck that has been running highway speeds.

[@treeguyable]

Worked on Mercedes Benz, and Nissan, for 7 yrs. Lost count of how many Nippon turbos' I replaced. Never replaced any Garrets,on the German motors. Got a 30 yr old Deutz motor/ turbo on my stump grinder, 22 yr old bobcat, same set up, motors and turbos have held up great.

[@mferrarorace]

Yup good advice. So many people don't know this.

[@daveb9370]

Not entirely related, but in industry we use oil heating units in extruder screws. The oil needs regular changes or it cokes, or basically cooks the carbon out of the oil. We experience this when they just shut down the machine because the operators don’t let the machine run on it’s cool down timer (it will shut off at around 150 degrees). Same concept in turbos.

[@isettech]

Standard time for many standby power diesel generators is 10 or 16 minutes for cool down after transferring back to utility power. 1 or two minutes may not be long enough to cool that amount of metal in the turbo housing so the heat does not migrate from the wheel and housing to the bearing area when it is shut off. You do not want to shut it off while it has been recently under load and hot.

[@stevecallachor]

This argument is like” which hand do you use to hold your dinner fork. It makes sense to be cautious, but a lot of folk just want to be right all the time. If your grandad told you to stop the horses at the top of the hill and not down the bottom, he probably had a good reason!!! Do what makes sense and don’t worry about being right!! Stavros

[@robr9905]

I had a new Saab 900 Turbo that lasted 450,000 miles with the original turbo when I sold it. Changed oil strictly on schedule and ALWAYS started off slow till the oil warmed up and ALWAYS spooled down and drove easy 3 minutes before shut down.

[@timbradfield788]

I was taught this on diesel turbo engines a long time ago. But I was wondering about all the new gasoline turbo engines and they have auto start/stop, isn't that a really bad idea to stop the engine at every traffic light. Could be some problems that begin in a short time. 🤔

[@JasonLuther1]

yes,

[@B.V.Luminous]

Yea, planned obsolescence.

[@ryan_layne]

They are water cooled and have electric water pumps that pump coolant for a couple minutes after engine shuts off. Seems to prevent issues, no problem. This has been the case since before 2006.

[@timbradfield788]

@@ryan_layne so the electric pump draws down the battery then when the engine starts it charges the battery back up. Are you really saving much fuel or just wearing expensive parts out sooner? Also when the engine starts it draws down the battery, then it charges it up again after starting.

[@ryan_layne]

@@timbradfield788 I don’t know what your comment has to do with turbo cooling, but since you want to start an argument, it’s a few watts, while the engine sits there wasting hundreds?thousands? in heat while idling.

[@plonkster]

As an analogy, or so it was explained to me, think of an old frying pan in your kitchen. That one you can never quite get clean anymore because of how badly the cooking oil has burned on. Same thing happens in a turbo when you stop the flow and just let the heat sit on the oil. Then next time it starts, that baked oil rips off the bearing surfaces, pitting the metal. Do it enough times, and the bearings fail.

[@gregkelmis2435]

I normally let the temperature on the turbo drop to well I have shut it off at 400° but usually I wait till it’s at 300° and if you’re driving slow it’s usually at 3:50 when you stop it only takes a minute or so to drop to 300. Am I doing the right thing?

[@strato_5459]

even before learning there was a real reason for it, i did it anyways with any of my vehicles i was just running hard. even just a couple minutes not long doesnt hurt. i could always feel a difference in heat coming from the front and wheel wells after a long hard trip when its shut off just emitting

[@linuxman0]

My father was a trucker for many, many years and owned several Class 8 trucks. For this reason, he ALWAYS idled his engine for a couple of minutes before shutting it down.

[@derek6044]

I noticed when towing heavy (28,000lbs) for long distances, a few good downshifts while slowing will drop EGT temp to below 400 before I'm even stopped.

[@LeTigre22]

Good advice for even gas motors that have turbos or superchargers. Especially for superchargers that are self contained oil systems. Let it idle for a bit before shutting off to get the heat out.

[@ghostwrench2292]

Since superchargers don’t have exhaust gases going through them, they run much cooler than turbochargers and I don’t think any special cooldown procedure is necessary.

[@Tallnerdyguy]

@@ghostwrench2292 They also have self contained cooling and spin MUCH Slower than turbos

[@formerice]

Ram's owners manual has good recommendations of letting it idle times. Bet few owners ever read.

[@robertotoledo1910]

Hey there this is Robert from Fort Myers Florida, 👋 interesting point of View, Even on my gas Chevy Silverado 2500 after a decent long trip I let it idle for a few minutes at least, I have a Volvo D 13 semi and I do this to for about five minutes after I’ve been running hard so I believe anywhere 3 to 5 minutes at least it’s a decent amount of time in my opinion so thank you for sharing your thoughts I appreciate it👌👍

[@maxracingteam23]

I never shut my semi off hot. Minimum let it idle for 5 minutes. A lot of guys just shut them off hot. And all I can say is I’m glad it’s not my truck

[@cylemarcum3305]

Used to be these things called turbo timers. They would let the car idle until the oil Temps came to a certain level and then shut off. That way you can get out and lock the doors right after you park.

[@issanajmeddine2794]

That actually made perfect sense to me, thanks man.

[@JeffAboularage]

Two things I cringe over..When people don’t let the turbo cool, and when people turn the key straight on without letting the pump prime.

[@cliftonsargent1572]

How do you let the turbo cool??

[@JeffAboularage]

@@cliftonsargent1572You do nothing. You let the vehicle idle and let the turbo bearings cool down…

[@cliftonsargent1572]

@@JeffAboularage for how long? Does it show on your temp gauge?

[@downhilldaddy5282]

Thing with these new trucks is, you let it idle and next thing you know it goes into regen

[@thatgreyplatty6315]

one reason I love the juice with attitude on my 99 cummins you can set timers or egt set points before the engine will shut down.

[@teejay6139]

"rest stop because your wife's gotta use the restroom" 😄 yep, you got that one super correct😀

[@FishyFelix]

Brass bushing on the turbo spindle and it floats on oil when the motor is running. Exhaust temps get up to 1400F during hard pulls and idles around 600F, so yes... always let your diesel idle for a minute or two before shutting down. Same goes for gas engines. Or any engine for that matter, warm up idle and cool down idle.

[@imprezaaudi]

Oil is for lubrication, coolant for cooling the turbo. There is too little oil to perform actual cooling. Same for the main engine, oil is for lubrication of all the main bearings, camshafts etc.

[@angrodNumenesse]

I have a Fiesta with the ecoboost turbo 3 cylinder. I always let the engine idle for a bit before shutting it down to extend turbo life. It does have a factory turbo saver that will turn on the radiator fan and a small pump that circulates coolant through the water jacket and radiator (when shut off hot) but I prefer not to use that method. I also generally let the car idle for a couple minutes after a cold start before driving. My thinking is that a couple minutes will allow a little heat into the oil so it can flow through the turbo better when I start moving.

[@geraldkoth654]

I have an Edge in my Cummins. It has a little dongle that keeps the engine running until you reach a set point of temperature in the exhaust. I have mine set for 450.

[@JESUSCHRYSLER5512]

To Gerald Koth: STOP IT! YOUR'E MAKING ME HARD!!

[@clintonscottwalsh]

We have a turbo timer in our diesel. Can let it idle from 1min to 5mins. Can pull the key out and will shut it's self down.

[@julesviolin]

My 2004 BMW M47 engine has done 200k miles and I turn it off as soon as I get home !! Unless you live on a Motorway slip road cooling turbo down will never be a problem. It doesn't use a drop of oil but I did disable the EGR when it was on 30k miles

[@kevinhenry177]

Yes this also goes with any turbo vehicle. You should always let your turbo cool down before shutting off your engine. Absolutely Right the heat will destroy the bearing in your turbo.

[@pwgervais]

Go head baby. Keep up with the content.

[@garydurandt4260]

"Coking", that is new to me. I have always thought that you let your engine idle to slow down the spooling of the turbo and if by killing the motor there will no longer be an oil feed to the turbo bearings which are still spinning at high speed and thus increase wear and tear.

[@drizler]

So how long do you leave your Direct Injected Gas truck during normal not pounding hot use ? I know the Greenie driven manufacturer won’t come out and say it in any manual? Same thing with compact tractor that’s being used gently. The manufacturer says don’t let it idle more than 5 minutes +-. How about that scenario saw while you shovel spread those buckets of dirt with a shovel ect…. Thanks.

[@lesterpenner8786]

Good info 👍. Trucks should have an exhaust temperature gage.

[@robertalumbaugh5286]

Good advise! Great explanation and show-n-tell. Thanks!

[@tythomas1991]

When I towe the camper, I normally never shut the truck off unless we stop for a while for lunch. Even when I take longer trips light I'll still idle the truck for a while before shutting it down.

[@jondoe4667]

The bird shit always lands right in your line of sight on the windshield, or on the driver's door handle. 😂

[@ehholden2376]

Best thing to do is the last 5 minutes before you stop is just cruze along Which will cool it down better than letting it idle As at idle the temps can rise as no air flow through radiator Been doing this for years and never had a problem along with regular oil changes

[@iantjasink6966]

i agree! argument!!! but as it is so critical why do the manufacturers not keep the engine running for a minute or two, even if you have taken the key out and gone fishing?

[@DDR248]

Small crystals are formed due to the heat. If these remain on the shaft, they act like sandpaper at the next start. This kills the turbo.

[@4runner4ever83]

I have a 1.8t gas turbo. Never had a problem with coking. After i shut down, there's a coolant electric pump that runs for 10 minutes to cool down the turbo.

[@tomjefferson3148]

great advise for all the newbs

[@mikelyons9971]

That's why many turbo cars have turbo timers. Even after the the key is turned off, removed, and car is locked the motor will continue to run till EGT and oil temps lower

[@ranger_dudeoff-roadadventu1903]

Very good advice there and the explanation why makes it so much better

[@HTSS8]

Coking isn't issue if using the most advanced lubrication in the engine which feeds the turbo oiling.

[@carlodonnell146]

I read somewhere that if you are going to put water into a overheated engine that it helps to keep the engine running while doing it; I suppose it means that if the water is moving while it is poured in, it is not a sudden temp. change as if the engine is not running? Makes any sense? also if your engine overheats on the road turn on the heater, and it acts as a second radiator.

[@blendpinexus1416]

my daily driver is a little 2000 honda civic and while it's not turbocharged i still do this a little since i live right next to the highway i commute on and i push the engine nice and hard on that 15ish miles of open roadway.

[@frootloops1655]

I used to fly a Piper P-Navajo (pressurized and turbocharged) and I always had to let it idle a couple minutes after arrival at the parking area for turbo cool down.

[@alscompleteoutdoor9091]

As long as my egt is under 400f I shut it down,takes about 1 minute to get to my parking spot from the time I enter my complex,its usually under 400f by the time I back into the spot.only time I let idle for awhile is after a 300 plus mile trip then I let it idle for a half hour while I unpack my stuff

[@johneden7975]

Great description for the young bucks with their hot rods! On a completely off topic question. How did you finish the inside of your Quonset hut, did you use strapping/furring strips under sheet rock?

[@litnin91]

Just to add to this... There is another reason you never shut a turbo-charged engine down immediately. Letting it cool off is a vital thing to do for longevity, but you also let it idle to allow the impeller to slow down to it's slowest speed possible. If you are out running hard, roll in to the driveway and immediately shut the engine down, that turbo could still be spinning at a pretty high RPM. Under load, they can spin upwards of 150,000 RPM. The speed will not be that high at shutdown, unless you kill it under load, but it could still be spinning upwards to 10-20,000 RPM when you don't allow it to idle for a short period of time. Then when you kill the engine, you stop the oil supply to that bearing, while its still spinning at a relatively high RPM. So you get coking from excess heat burning the oil AND you are depriving the bearing of oil flow at the same time, which also adds to the potential for bearing failure. I've seen turbo failures as low as 15-20k miles due to lack of knowledge on how to properly shut one down.

[@ronaldbabbitt6318]

Awesome thanks brother 🏁 Lmm in Colorado 🤠