Originally Posted by davidijames

So I am considering swapping in some forged pistons. Will contact wossner as I think this listing should ready M264 2019 -2021

https://wossnerpistons.com/products/9530

If anyone is interested below are MB part numbers for OEM pistons for the M274 and M264

M274920 Piston Part No : 274920 2740300900
Bore 83.0 mm
Stroke is 92.0 mm
Compression ratio 9.8:1
https://www.motorreviewer.com/engine.php?engine_id=176M264920 Piston Part No : Variant One - 2640302100 AND Variant Two 2640302200 (yep two versions)
Bore 83.0mm
Stroke is 92.0 mm
Compression ratio 10.5:1
https://www.motorreviewer.com/engine.php?engine_id=177

Originally Posted by davidijames

As an update MB no longer offer the new engine or new basic engine they only offer the long block part number 2740103116 80
The additional 2 digits at the end (80) mean it's a remanufactured part therefore the following must be outdated
b2bconnect.mercedes-benz.com/gb/products/remanufactured-parts/cars/engines/basic-engine

Originally Posted by Vasny

***UPDATE***
After Mercedes needing an extension to respond, they finally responded and know that they can’t get into a deeper hole. They now asked if I want them to repair my vehicle and pay for the inconvenience or to reimburse me for my car for the price I originally bought it for. Given this awful new vehicle market, I chose to repair my vehicle so my lawyer is getting back in touch with them and we’ll wait to find out the final decision. As of now the repair has not been approved YET.

Originally Posted by Shannonk24

Hi, I am having the exact same issue with my 2017 C300. Can you please let me know which attorney you used? I am also located in California. Thank in advance for any help you can provide.

Originally Posted by DYC300

As someone with a 2017 C300, nearing 65k miles, this upcoming year should be interesting...

Originally Posted by dimbmw

Maybe someone will find it useful.

California car, W205 C300 4 matic. Slightly over 4 years, about 65K miles.

Timely serviced etc.

Cracked piston in cyl 1.

Mercedes refuses to cover 100% of repair costs , which is in my view ridiculous as cracked piston is not something that normally happens as the result of normal wear and tear, especially in a 4 year old car.

This will be my last Mercedes, lesson learned ! Bye, Mercedes.

Originally Posted by crackedpiston15

im sorry you’re going through the same mess and yes, do fill out that NHTSA complaint and make sure to emphasize how unsafe it can be for that to happen to any car on the highway. Highway patrol did tell me that it’s a traffic safety hazard . I also want everyone here to know to cross your fingers because two weeks ago I sent an actual physical letter to the NHTSA administrator and it was a Defect recall petition . The difference between this and an online complaint is that my petition will assure by federal law that our problem will be investigated by the nhtsa within a certain amount of time (believe it was less than 90 days ) and if the deny it they are also required by law to state the reason for denial in the federal register . It’s something I found out about through by hours and hours of reading to figure out a way to make sure Mercedes’ takes responsibility for this problem . This problem is also affecting owners of glc300’s , metris vans and some other Mercedes’ models with the m274 engines . The more complaints we have on the nhtsa site , the better as they will see my petition and look for others with the same issue . I did send them screen shots of various complaints all with the same issue to get them started . I’m very confident this will be resolved so we all just need to have faith and hang in there just a little longer .

Originally Posted by cyberghost00700

You know what needs to be done in case like this....Class Action Lawsuit....that is what we need so Mercedes starts looking into the problem! I had cracked piston in cylinder one at 20K miles and 2 years of ownership - and I paid good money to own this car, over $50K.....

Originally Posted by benzgarageking

Having the same issue... Cylinder 1 loss pressure due to piston ring came off, I just passed by CPO warranty by 10 days they would need to replace the long block for $8k........Mercedes corporate did offer much help ether.

Any advice guys?

Originally Posted by chassis

Sorry to hear of the situation. Thanks for posting on this thread so owners with experience navigating this process can help. MB failed consumers (again) on this one.

Originally Posted by Shannonk24

Hi, I am having the exact same issue with my 2017 C300. Can you please let me know which attorney you used? I am also located in California. Thank in advance for any help you can provide.

Originally Posted by Shannonk24

Hi, I am having the exact same issue with my 2017 C300. Can you please let me know which attorney you used? I am also located in California. Thank in advance for any help you can provide.