na1khan

I owned a 2018 C300 Cabriolet and it has only 60,120 miles. The engine failed due to Piston #1 broke off. The car was well maintained and serviced by the Mercedes Benz dealers. I strongly believe this engine was a lemon and the Piston was a defected piston. Is there any help available from Mercedes Benz?

W205C43PFL

Sorry to hear about this. We need more information, what octane was the fuel that was used, was this vehicle yours since new or was it a used vehicle, maintained and serviced by the dealerships at what intervals, what intervals were the engine oil and filter changed, what is the oil viscosity and temperature used? You could find that in the work order. What State are you in and what are the typical temperatures (engine oil, coolant and ambient temperature) the vehicle is operated in?
There is currently an active lawsuit on this: https://www.classaction.org/news/mer...ng-m274-engine

MBpippo

All the best with a successful outcome @na1khan. Class action looks exactly your issue.

chassis

Welcome! Sorry to hear about this. Please investigate the class action to see if you are eligible to participate. MB failed on this engine, sadly.

MJ50

moved to W205 forum...

Cosworth2000

This is why I own the V6.. Mercedes makes bulletproof V6 engines that are even more robust than the V8 engines. I understand why someone would purchase the fuel saving C-Class but it's a real hit and miss on that engine but I think that if you had this problem, you may want to look up any Class Action against the engine and see if there is anything online.

realeric

I hope the class action go through. This is bigger issue than Hyundai Theta II engine.

Cosworth2000

My wife drives a Hyundai and is currently part of class action as her engine eats oil like there is no tomorrow.