Common High Mileage Issue With Mercedes-Benz M157 & M278 Twin Turbo V8 | 603 MTech Autowerks® 

And spend more than the cars worth replacing it, yep :)

@@thenestaheapstv2447 lol ok

@@AnontheGOATjust don’t complain when you sell it and someone low balls you because of the issue👻

@@thenestaheapstv2447 I won’t sell it to a lowballer.

@@thenestaheapstv2447 dont be a pussy and just do it yourself

Thank you so much for this, just bought a Gl450 V8, production date 03/14 with 132k miles on it. Already had a heart attack before i saw your reply! Thank you so much! Is there any other problems to look out for please?

You can check by using the oil dipstick, Coolant tank or by observing under the oil fill cap. You will notice a thicker than normal fluid. If it looks light brown, and not clear when you shine a light, than you may have an issue.

Find your coolant leak and get it repaired. It'll cost you your car if not taken care of.

Most common in our 2014 gl500 also was the water pump. Original waterpump pulley was black the upgraded is silver it would leak behind it. Also the bottom hose connected or the thin turbo coolant lines infront of the water pump are super common in this gl. So check that. On top of the engine the black 3side breather hose I just used gasket maker paste to stop leaks it's easy, anyhow coolant leak on this engine should be priority or else major damages. Goodluck Edit: I forgot to mention don't let fan or tools touch radiator. I cracked a small hole and repaired with steel epoxy/Jb weld. Working fine but just advise

yes, they won't suffer this failure - Go ahead and read the TSB applicable to your year for insight

Me too. Last thing I read was cold weather and cold starts. What would be the cost of the engine rebuild? Do you have an estimation?

How many miles?

180k

Get the same car just production date after 12/13.. problem solved.. i work on these there good engines the earlier ones (2012-late 2013) just had issues when they aged.. after 14 the tensioners are updated and the oil mixing issue is fixed

I hear a very slight knocking on cols start on my 14 gl63 should i worry about anything? Or wat can i do to stop it​@strykz63

Exactly

I think on his other video he says yes. He said they are the same engine but the m157 has bigger turbos

@@CornerOfTheOvalm157 is a 5.5 and the m278 is 4.7. Different displacement.

@@AnontheGOAT Basically the same block with a different bore and stroke to increase the displacement to 5.5.

@@godzsonjl2983 I know but still had to point it out that the displacement is different.

And one major difference is that the m157 is hand built which is a huge standard in the automobile industry

Its possible.. as long as your production date is 01/14 or newer your good.. but i have seen CLS 63s with high mileage pre 2014 with no issues

By the way, is the S 45

They didn’t make a twin turbo v8 in 2010!! 2012 is when they started and the Mercedes l didn’t release until 2013 with a ttv8

m278 came out in 2010 in the S550 CL550

​@@Mike-ht1outhey came in 2011 for model year 2012 with v8tt in S-class and CL-class... 2010 is still the M273 engine

Older M119 and even M113 are ultra reliable

No they dont... im a Mercedes technician.. it was updated in 01/14 and on

Same engine just get the updated one 2014 and newer.. i belive these engines ran up to 2017

GLS550 used m278 till 2019

@@linopks1638 ok.. yah your right

it's a different job. All distinct failure are worthwhile

@@glasser2819 but that cover needs to come off for the timing chain to be done so the seal should get replaced

@@slotank the heads do not come off, only the valve cover.

@@mauisuzuki7857 i got my timing chain done by the dealership recently they took the heads off on the m157 and replaced that gasket as well

Chill 🛑

If its mixing its not his fault hes just letting you kno what to look for

Can you repeat that, but this time in coherent English.

So Mercs are junk. Sold my GL350, glad I did.Made me nervous

Lol stop going off of one technicians opinion plenty of pre 2014 m278 kicking it with high miles including mine 2013(136k) Take care of your car and stay on top of maintenance problem solved this guys job is to fix broken shit

I have owned 3. They all ran great and were well maintained. The biggest issue ive had was control arms 1k dollar fix

@@Jellbell46 what was the kms and how long did u own them

I have a sl63 and a e550 coupe, both tuned. The sl is a 2013 at 29000 miles and the e550 has 77000 miles and has been driven hard for about 40k on a tune making 570whp. The car runs awesome and has zero leaks or any issues with mixing……I’ve seen these cars go 160+ without any issue

Yes, m113 is a beauty ! We own one. Also own the m157, runs beautiful !, at 88k miles. Water - oil mix is bad news. Hope Mike can come up with a repair solution for all. My ml63 new was 138k dollars ( I didn’t pay that !) as I saw the paperwork. Your telling me a beautiful rig like a ml63 at that price point will only last 99k=say 110k miles ? That doesn’t seem right. Hmmmmmm

@@jeffreyhebda6709 Do oil changes (goes without saying fully synthetic 5W40) every 5k, high quality synth oil protects metal bits and has additives that keep the gaskets from going brittle/thinning. Switch to highmileage oil if you can. Every 30k add liqui moly motor oil treatment, it rejuvenates gaskets. Every 50k do a coolant flush, coolant from MB ONLY unless you know what you're doing Keep the RPMs >2000 until engine reaches optimal temp Remember heat and old oil is the N1 killer of plastics/gaskets in the enginebay. My 2013 GL550 with M278 I bought brand new with 0miles in 2012 now has 269.000. I did EVERYSINGLE engine related service myself, even during the warranty period I was doing oil changes myself every 5k. (Noway in hell im stretching oil change interval to 10.000miles!). All I did to the engine since I bought it was: fluid changes and filters waterpump+thermostat ~@135k dreaded CPS+camshaft adjuster magnets 2 times, first set @90k second set @200k sacrificial CPS+camshaft adjuster magnet harness extension coolant plastic hose on top forward center of the engine @160k. Thats all I did. The catastrophic problems as mentioned in the video are the result of people not doing maintenance treating it like a gm truck from 90s and following MB dealer oil change intervals. 90% of the timing chain and VVT related problems can be solved by shortening the fluid change intervals. Even shorter if car is used in extreme temp climates like up north or down south.

​@@jeffreyhebda6709solution is to repair it early as maintenance or exchange engine after all

trying to get myself into a cls550. anything major i should look out for when looking at used ones?

​@@Ghostrider-xd3xvjust get you one brother. With a bumper to bumper warranty. It'll cost you about 3k. It can last 2-3 years. If the engine or other important things fail, you'll be glad you spent that 3k vs 8k or more. You can take it to a dealer for the fix OR find a reputable licensed mechanic that KNOWS how to work on these cars. Just understand how the warranty works. Understand how much the regular things (tires, brakes, insurance, putting gas in the car) will cost vs owning a more simple machine. If you can afford it and it doesn't break you then do it.

Same here 2014 cls550 been great