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2016 GLC300 Cracked Piston #2

14023 Views 33 Replies 16 Participants Last post by  Madoc

I have a 2016 GLC300 and a check engine light of misfire. The car has 56K miles on it and what do you know it is out of warranty by 6k miles and few months. Dealership has checked out the vehicle after taking the head off to look inside the cylinder #2 - found out that cylinder #2 has a cracked piston that is 1.5 inches long. I have contacted Mercedes' customer service and corporate has declined my good will warranty claim giving me the usual run down - the vehicle is a 2nd owner, even though the maintenance has been done completely at the dealership, it is out of warranty so on and so forth. It is now up to the dealership and regional manager to perhaps cover it under good will warranty or give me a big discount. The estimated bill is $8,500 - WOW! I live in New Jersey so prices could be a little higher.

I really think that there is a defect in that piston that led it to be cracked at such a low mileage. Whilst I understand the mechanics of how cars work and may break down after abusive usage and low maintenance, I assure you it is not the case here. This car is taken care of like it is a baby - very clean up to par on so many levels. A "MERCEDES-BENZ" should not simply have a faulty piston like mine that cracked due to what ??? nothing ??? If it does, it should be covered based on records of maintenance and good will and they should 100% stand behind their cars. What do you guys think? Has anybody had the same problem in these cars or in any other cars that have the same engine like the C class? I am asking if there is anywhere to turn/ escalade this situation to get this car fixed by warranty?

Please comment below - anything is appreciated.
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My only problem is nowhere in the Xentry document does it mention cracked pistons. Unless the crack in the piston extends to the wrist pin bore, M-B can refuse to relate the crack to the wrist pin knock issue.
I guess I'm lucky - knock on wood. I bought my 2017 GLC 300 4Matic in August 2020. Went from 94,000 Km to its current 201,000 Km, no issues, powertrain-wise.

I don't know what the price is for the parts, but to pass a flex hone in a cylinder and rinse it down with brake cleaner before reassembling it shouldn't cost much.
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