Full Vid, Hans gets new Spark Plugs; Mercedes W205 C400, 450, c43 AMG spark plug replacement

Just a quick Vlog of how I replaced the spark plugs in Hans, my 2015 Mercedes Benz C400 4matic.

[@CLOUT21]

Helpful video thanks man ! Was able to get the job done wit one of my buddy’s

[@A.Musa76]

Like to add to this because I was a victim but should have checked it first. The new spark plug check the gap before you install it. You’re going to break those sensor plastic clips. The hardest part is removing the sensor and coil packs harness plugs without breaking the lock clips. For the pressure sensor harness you don’t need to disconnect it. Removing the sound insulation damping be careful with those (2) plastic clips I almost lost one of those clips. The 14mm spark plug tall swivel socket is the way to go. Never use a torque wrench on any of spark plugs change I have done plenty of motors.

[@arlokkkk]

Thanks for the video! I have a couple of questions if I may. Do I really need to replace the coils when doing spark plugs on my 52k miles 15 c400? What oil filter do you recommend and how the JB4 treated you? I'm car still on the stock tune and I want something to increase the psi a bit. Thanks!

[@twoc400s5]

I, personally, did not replace the coils. If they separate from the plugs with no visible damage upon inspection and you don't have any ignition issues, there's zero reason to replace the coils. I recommend either Wix, Mann/Mahle, or MB brand oil filters. Any of them will be fine. I really like the JB4. Very easy to install and a lot of nice features. I wish BMS had a bit more time to answer questions about tune/mods via email, but the product is solid.

[@arlokkkk]

@@twoc400s5 good to know man. Thanks for the help

[@murlocmerc]

How has the reliability been for this particular model?

[@twoc400s5]

No complaints so far. My first one has almost 100k miles and no major issues. One small oil leak that was pretty easy to fix, and a new guibo for the driveshaft have been the biggest things that needed replacing. Even those two things were not emergency repairs. Everything else has just been basic maintenance.

[@tejaberberich5767]

Good stuff, thanks!

[@seejeh4060]

I’m at 53k miles do you recommend I change spark plugs

[@twoc400s5]

Probably, I think the service interval is 44k miles

[@christopherscotto7897]

Is the gle 43 amg the same ?

[@twoc400s5]

I'm pretty sure. Or VERY similar.

[@arlokkkk]

I can’t freaking remove the coil plugs. Arghh

[@twoc400s5]

Yeah, they can get very stuck on there if there isn't enough grease. Try using a nylon pry bar tool. There is a (very small) flat projection on the underside of the coil plug tube, I have needed to use a nylon pry bar levered into that flat spot to remove really stuck ones.

[@arlokkkk]

@@twoc400s5 Thanks! I was able to do it. Did only the left side. I will do the right side tonight. Other thing that was really a pain for me to do is to remove the coil boot. Mine got really stuck. I had to buy a spark plug boot plier. Question: which air filter do you use for the stock intakes? K&N?

[@twoc400s5]

@@arlokkkk I stick with OEM. The ones from my dealership are Mann.

[@arlokkkk]

@@twoc400s5 thanks! Have you ever done a tranny oil change? I'm about to do mine and not sure if I should also change the torque converter fluid too or not.

[@Justinjcs100]

kzbin.info/www/bejne/o4m8lIhrnauLhKcsi=m2cvCR-Y2FV9xfGe

[@MercedesMan]

2 C400’s???? Respect to that!! 🫡 I see one a year if I’m lucky!

[@GenXPertChannel]

It would be interesting to compare the non-genuine Mercedes branded plugs to the ones sold NGK branded to see if the threads start at the same point. The Benz plugs are self-indexing based on torque value- and there multiple engineering documents that have been released my Mercedes over the years that state these plugs must be indexed up to 45 degrees to either side of the injector. By using a torque wrench at the end of its range, it's likely significantly off- precision measurements should never be taken in the bottom or top of the range... and using anti-seize which is not recommended by every single engineer who designs engines, no way to know if your plugs indexed. I know you've said before you "never had a problem" using it, but here's a problem- and nobody has ever had a problem from not using it aside from pulling plugs out of junkyard heads after a decade in the rain. Apply dielectric grease to the plug body and contact enhancing grease to the electrode so they go where intended during coil installation. Dielectric grease in the tube can get on the electrical contact during installation using your method, and would be a bad thing. Dielectric grease is for sealing connectors, and is NOT a contact enhancer- it's an insulator and therefore quite opposite, by the very definition "dielectric." DeOxit makes a great contact enhancer that I use on performance cars and airplanes. Enjoy the C400! Hope your cam adjusters don't follow the current trend.

[@twoc400s5]

@@GenXPertChannel since I made this video I have had this conversation multiple times. I recently replaced the plugs on my wife's C400. Those plugs were done at a MB dealership. I marked my socket with a mark pointing to the injector and meticulously noted the orientation of the MB plugs installed by an MB dealer. Guess what? NONE of them were indexed to the MB spec. Those plugs had 60k miles on them, and the car itself has 120k miles with zero issues. My car ran its fastest pass in the quarter mile ever with the plugs I installed in the video. Net/net? Indexing on the M276.8 motor is a waste of time. You know what's also a waste of time? Trying to pull seized plugs out of an aluminum cylinder head. Good luck to you!

[@twoc400s5]

@@GenXPertChannel dielectric grease on the contact is a non-issue. More than enough mechanical pressure between the contacts to push through a thin film of dielectric grease.

[@Justinjcs100]

Use the rubber oil filter wrench to remove the spark plug boots! kzbin.info/www/bejne/o4m8lIhrnauLhKcsi=m2cvCR-Y2FV9xfGe