Got mine back a couple of weeks ago. Everything seems fine, but the check engine light came on a few days ago. Going back to the dealer again to see what triggered that. Engine performance is normal though.

Hey all, I just purchased a ‘15 C300 4M and I’m pretty certain it has wrist pin issue. I’ve read that it may and may not cause damage to cylinder walls. So what’s the verdict? My vehicle is under warranty till 2020 and I’m debating wether to do the fix or not. Was also wondering if anyone uses MB of Greenwich? How are their service techs there? Thx everyone, love the car by the way!!!

let me know what’s up, I’m curious. Mine runs great no lights. Just the harsh 19” wheels and run flats are my only issue but it’s liveable.

So I ended up having mine replaced. According to my dealer, the wrist pins that were installed allow for an increase in fuel economy and have no negative impact on the engine itself besides the noise. However enough have complained that it is a warranty covered issue. I got mine replaced and am definitely happy with the way the engine sounds now. It sounds exactly like the newer models, quiet, minimal knock. However, supposedly the newer pins will effect fuel economy, not sure how much but that’s the trade off supposedly. If you can, id have it done. Mercedes Benz of Music city did mine, the Tech had already done 4 vehicles prior to mine, 32 labor hours 😅 and who knows how many parts later I got an 8 page print out. Couldn’t fathom the cost.

Good to know and glad to hear the repair worked out. Thanks for the info.

Just picked up my car from Walnut Creek. The technician has done so many of these repairs that he is now able to finish in 18 working hours. They began the work on Tuesday and had the engine back in the car on Friday to begin testing. They also said that on 4matics, they are required to give the car an alignment. I am thoroughly impressed with how the car drives and sounds. I’ve put about 30 miles on the car so far and everything feels tight and literally brand new! Will continue monitoring for any issues during the break in period. Amazing service and job well done for the team at Mercedes of Walnut Creek.

Just PM’ed you AChan

Fyi, started the car while cold this morning and the engine sounded perfect. No clicking/clattering while decelerating either. Drove a good 50 miles since I’ve picked up the car. Couldn’t be happier with how everything turned out.

Dropped off my ‘15 C300 on Sat 3/31 for possible (most likely) wrist pin noise. Also have them doing 2 door handle lights and replacing wipers that were never replaced during certification process.

Pretty much same here....dropped it off Sunday. They confirmed wrist pin on Tuesday and ordered the parts. Tech told me should be ready in a week.

Would one of you mind giving the SA you went with at Walnut Creek?
I actually had the wrist pin done back in August at Steven's Creek, but the clicking sound while decelerating was happening again and they say they don't hear anything abnormal.