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Sorry to see so many dealing with this issue and I hope it works out well for anyone having to deal with this. It seems to me that owning a modern Mercedes without some form of warranty coverage is a financial gamble.
Sorry to see so many dealing with this issue and I hope it works out well for anyone having to deal with this. It seems to me that owning a modern Mercedes without some form of warranty coverage is a financial gamble.
I'm with benzdude, this thread IS scary!
Its scary, because i am at 55k with only 1 year of paid extended warranty left.
Will those third party warranties cover $10k+ engine repairs?
I'm sure any warranty provider would try their best to wiggle out of that. "Oh, you didn't change your air filter at xx,xxx miles, so your piston cracked... sucks to be you." (lol), but unless there is specific exclusionary language in the contract specifying a repair cost cap or other specific requirements, I can't see how they can get out of it legally.
This is the result of my pathetic 2015 W205 C300 4MATIC, CYLINDER 1 is cracked... needs a new engine at 70K miles... I've maintained oil changes every 3k miles... meticulously monitored my maintenance and was up to date on all specifications.
Mercedes won't pay for this... and this is going to cost me $10,000.... for a car that's fully optioned and MSRP at $52,000K this is pathetic. I will never buy a mercedes again.
Mercedes must stand for this wrist pin issue or i will start a LAWSUIT.
curious - what specific oil were you using for your 3k mile changes ? Did you ever change the air filter ? What type of gas do you use (grade and brand)?
Looks like a piston defect. But first, what is the notch/deformation in the top surface of one end of the crack? Is it a valve relief or a dent from impact or collision with another component (valve)?
Note how the crack doesn't appear to exist in the topmost edge above the top ring. To me it looks like the combustion chamber surface has not been compromised.
The crack appears to either emanate to, or have emanated from, the wrist pin. Because the crack doesn't happen when the car is driven off the showroom floor, it is a fatigue (cyclic stress) crack in my view.
Do you have the piston in your possession? Can you post photos of the underside, facing the crankcase? And photos of the top surface exposed to the combustion chamber?
"Hot tune" as some have speculated to be the root cause is not ruled out. And it is not ruled in. Inferior piston design (my opinion for the root cause) or a bad quality batch of pistons from the supplier (not the root cause in my opinion) could fail as pictured, hot tune or no hot tune.
Looks like a piston defect. But first, what is the notch/deformation in the top surface of one end of the crack? Is it a valve relief or a dent from impact or collision with another component (valve)?
Note how the crack doesn't appear to exist in the topmost edge above the top ring. To me it looks like the combustion chamber surface has not been compromised.
The crack appears to either emanate to, or have emanated from, the wrist pin. Because the crack doesn't happen when the car is driven off the showroom floor, it is a fatigue (cyclic stress) crack in my view.
Do you have the piston in your possession? Can you post photos of the underside, facing the crankcase? And photos of the top surface exposed to the combustion chamber?
"Hot tune" as some have speculated to be the root cause is not ruled out. And it is not ruled in. Inferior piston design (my opinion for the root cause) or a bad quality batch of pistons from the supplier (not the root cause in my opinion) could fail as pictured, hot tune or no hot tune.
I’m wondering why there is so much carbon buildup between the two compression rings. I wouldn’t expect to see that much after the first ring.
This is wild speculation on my part but I wonder if there might be a difference between using synthetic oil and conventional oil? Maybe the engine clearances are so tight that conventional oil isn't flowing through the tight spaces as well as the lighter, thinner synthetic oil does and that's what's causing the problem?
The problem was fixed around April of 2015 so you should be ok I believe. I had our 2015 checked yesterday that falls with in the date and vin ranges with 32K miles and was told we don't have the issue, atleast not yet. I've got almost 4 years of unlimited mileage warranty so I know when we will be trading it in.
i bought my 2015 w205
min October 2018, with 53k miles
im now at 115k miles.. wrist pin issue was a thought at one point.. but it was the alternator
coupling making a clacking noise..
Unfortunately I have joined the M274 piston 1 failure club.
Bought the car new, special order, built in Germany took delivery 5 years ago. Out of warranty 72k miles.
Having dealer install rebuilt long block n turbo - some financial help from the dealer but still over $8k to repair - disgusting. I wish I knew about the problem before the standard warranty expired - I was getting different dealer quotes for the extended warranty- nobody mentioned issues with the engine - decided not to go with the extended warranty ( huge intake in hindsight).
Last edited by martinsw; 10-28-2021 at 01:53 PM.
Reason: Typo
I recently had vibration at idle along with oil around the bcv. Compression check and low on cyl 4. Pulled the motor and cracked piston. 13k from dealer to replace the piston. Parts are about 600 ish plus I sent the turbo for a rebuild to turbo kits for 550. Engines are engines Mercedes or not. Nothing special. Turning a wrench yourself isn’t hard. Don’t be scared. Things happen to any engine at any time. Mine is a 2015. Already started the rebuild and should be running in a few days.
Unfortunately I have joined the M274 piston 1 failure club.
Bought the car new, special order, built in Germany took delivery 5 years ago. Out of warranty 72k miles.
Having dealer install rebuilt long block n turbo - some financial help from the dealer but still over $8k to repair - disgusting. I wish I knew about the problem before the standard warranty expired - I was getting different dealer quotes for the extended warranty- nobody mentioned issues with the engine - decided not to go with the extended warranty ( huge intake in hindsight).
Sorry to hear about this. Disgusting is the right word. MB quality and reliability are disgusting.
I recently had vibration at idle along with oil around the bcv. Compression check and low on cyl 4. Pulled the motor and cracked piston. 13k from dealer to replace the piston. Parts are about 600 ish plus I sent the turbo for a rebuild to turbo kits for 550. Engines are engines Mercedes or not. Nothing special. Turning a wrench yourself isn’t hard. Don’t be scared. Things happen to any engine at any time. Mine is a 2015. Already started the rebuild and should be running in a few days.
My 2016 W205 C300 having same issues 55k miles with all codes you guys had mentioned. P219C, P301, and more.....
I had at least 5 MBZs in my past and more in my family members, never had this experience of Check Engine Light repeating and SHAKING engine, while under busy traffic commutes.
I don't even want to go to dealer and get my *** bend over to MBZ dealers........ they are nothing but making $$$$$ from innocents loyal customers whom had given them repeated business.
I don't know what to do next. I still owned 4 others MBZs and those cars never had this serious issues.
park right outside of MBZ dealers to set on fire on my worthless C300 to boycott and get attentions from MBZ factory to paid back all the troubles they had caused to innocents customers.
was thinking of trading EQC, but "F" ....MBZ for now, NEW EQC might NOT even better than Toyota's Plug-in Prius.
colorful BIG *** screen doesn't mean anything, when my engine is shaking worst than diesel engine......enough SAID!!!!!
I had the exact same thing happen to me last month. I bought a preowned 2017 C300 30k miles on it still under factory warranty. Im in Los Angeles. The engine started losing power and wobbling on the highway and its scary. Argued with an MB rep over phone but to no effect...still they replaced only the piston and not the whole engine. Planning to call them this week to as them a reason for the pistion failure in writing. Im thinking they could be a lawsuit here somewhere. Getting half assed repairs for a $60K car doesnt feel fair. Its a scary experience to have your engine go out on you on the highway. I think if we deal with them individually they are taking advantage of us. If we group together then its a lot more scarier for them. What are the steps needed for a class action lawsuit? Any thoughts?
I am with you all......Infact I have two C300, one is 2005 and another is 2016, stuck with NOT perfect MBZ C300s....
WHY extended warranty had to do with this missed fired engine issue....you work for MBZ marketing.
I'd never believed in this kind of extended warranty......all my older 5 MBZs that I'd still owned fixed by independent mechanic shop who know MBZ. for over 200k or 300k miles on the engines without any cylinder CRACK.......
this is SICK...
10-13-2021, 07:37 PM
I might lease one instead.
