Originally Posted by seamus2154

None of us will ever know the real number of failures. MB will never let that be known. Then there are those out of warranty that arent on forums who just sold the car as is or did an independant repair. There are many posts on several forums for some time now, and now that the mileage is getting higher there seem to be more popping up. I have a vested interest in knowing but am not interejcting a bias towards "its nothing" to make myself feel better which is what some are doing. No car should have such an issue at all especially under 75K properly maintained. Yet they are happening. Its an obvious defect as its the exact same issue. I have an unlimited MB 2 yr extended warranty. In two years I will figure whether I am in or out, but not risking a 12-20K repair on a used cheap truck.
MB is clearly just trying to get though the warranty period. Its a financial decision as thats the cheaper way to go for them. That doesnt mean its not a real problem.

Well I just did my trans service at my trusted independant shop who has a former Mercedes tech. His words when I asked him his opinion on the motor. "well I can tell you I changed alot of motors in that generation truck" !!!! He said its a real problem, he wouldnt own one. Thats one tech in one dealership with only that exposure....think about that. Think about what we dont know. Everyone who owns a MB is not an enthusiast or on a forum. This can be an echo chamber. But my techs experience speaks volumes.

There are known issues with many manufactures. Just because it didnt happen or happen yet doesnt mean it wont. Where there is smoke there is fire.
I had an E46 M3..........Huge SMG trans problem with that generation. Great car in 100 ways...but there is no denying the issue. Mileage got higher more SMG reports. It took many years for it to BE KNOWN. The same is happening here. Why people deny something because it isnt presently happening to them I dont know. Will they come back if it happens and say I was wrong??

Originally Posted by S70Houston

Are you guys trying to make a Harvard degree out of this?

Originally Posted by karmikan

Didn't notice any Woke indoctrination in any the posts so probably no Harvard influences yet. Mind you, there is some Critical Piston Theory so we might be getting there.

Originally Posted by edpare

I hope you will excuse my ignorance, but if LSPI always cracks piston lands, seems to me the fault is with metallurgy and/or piston design.
In the old days, we used to be able to hear pre-ignition. I don't remember anyone reporting that.

Originally Posted by Ghickmb

Exact same as my vehicle, 0 compression on piston 1. Engine is toast. I am the 2nd owner, original owner had purchased extended warranty set to expire next week. Dealer tried the "warranty does not apply" spin even though the control arm replacement had been covered 6 months prior.

It has required persistent effort, constant pressure, assertiveness/aggressiveness and daily trips to the dealer. They do not like to hear contacting media and lawyers is a road you are willing to go down.

The dealer has been stalling and dishonest in their communication. Today I contacted MB Canada and filed a complaint. I will post an update on the outcome.

I did speak with a former MB technician who recommended a replacment engine with a manufacture date from July 2023 onward. Refurbished or repaired would result in a repeat of the same problem.

Here's some info I found while researching this issue, it may help you in your communicatuon with the dealer:
1) A class action has been filed in the US, Jamil vs MB, case #2:22-cv-08130. Plaintiff is represented by the Kalfayan Law Firm, Del Mar, California.

2) The NHTSA-ODI has initiated a defect petition, DP22-02. Stephen Ridella was the Director who initiated it. Notable in his letter to MB, the alleged defect is "incorrectly sized or otherwise unsuitable wrist pins causing mechanical engine damage".

3) There was an XENTRY notificatuon sent to MB service departments on 10-15-2018 about the clattering/rattling noise from the crank assembly of the M274 engine, topic # L103.10-P-060916.

4) Car complaints has a littany of consumers with the same complaint, mostly piston 1 with 0 compression. One customer refers to the M274 engine as the piston cracker.

This is the best vehicle I have ever owned, love the comfort and the ride....ever so disguisted, disheartened and disappointed that MB is not doing right by it's xustomers and issuing a recall!

Originally Posted by Dawgpound22

Have you made any progress on your MB?
Update on mine:
The extended warranty company originally denied my claim (sighting insufficient maintanence records) I went over the maintanence records in detail I have every oil change (7500 miles) documented with receipts for oil, filters, air filters, miles, tire rotations, battery replacements everything I ever did to the car in chronological order and documented. They still gave me a hard time. They then had to resubmit my claim to the adjuster now are requesting bore scope photos from MB dealership, which MB sent to them 3 days ago and I called they didn't even upload them into the system these companies are a joke .. I filed a complaint with MB USA they said a MB referral manager would get back to me in- 24-48 hours I never heard from them I had to call back a week later they called and left a message I called them right back no answer I have left two messages since then no reply. The dealership did give me a loaner car its been 3 weeks now since the catastrophic engine failure. I called an attorney today for a consultation because nothing is progressing in any direction. I think MB is waiting to see what the warranty company does and the warranty company is waiting to see what MB will do. MB Sh*t show should of kept my BMW had 140k miles on it ran like a champ......

Originally Posted by chassis

Sorry to hear about the travails. Best wishes to come through this situation as satisfactorily as possible.

MB is such a failed state. It’s the worst of the worst in the auto industry.

Originally Posted by Meadee

I have a 2016 GLC 300 4-matic that I loved, until last Friday. I drive a lot of long highway miles and take immaculate care of my vehicle and perform all suggested maintenance. While driving home through a very remote stretch of highway, my GLC suddenly started shuddering. No smoke or loud sounds, just shuddering. I pulled over and popped the hood, like we all would do. I saw nothing out of the ordinary. I tried restarting it and the idle was low and vibration was still there. I had a 2 hour tow (thanks to MB roadside service) and made it home 5 hours late. The local dealer in Bend, OR (great guys) said the piston failed and was ruptured on the top edge and the engine would need to be replaced. It is about a $12k fix. I'm out of warranty, but am flabbergasted that a 2016 with 66,000 miles on it already failed. Does anyone know if this is a common thing with this model, or year? I'm wondering if the fix is worth it.

Originally Posted by jsdanish

So while I know failures happen, having run a repair shop for 40+ years [retired] your comment "suggested maintenance" might be an issue. Milage for oil changes were extended to make customers happy. No turbocharged 4 cylinder should go 10K on an oil change. Oil is used to cool the turbo bearings, I do 5K on mine, as even once a year is a concern. The factory became obsessed with low maintenance , my 05 ML 500 is 13000 mi - no way.
jsdanish ASE Certified

Originally Posted by converse

Same thing happened to me. I drive a 2017 GLC300 with about 50,000 miles. Bought used in October 2021, engine failed this month - same piston problem as everyone is describing. $12,000 for new engine not including labor. I have an extended warranty but it doesn't cover everything.

This is obviously a manufacturer's defect.