hogdad

As for the 4 cyl turbo comments this is the most intelligent response I've seen here, it also happens to be mine but even if it wasn't it is pretty spot on:
Saying the 4 cylinder is a piece of crap is like saying a Swiss wrist watch is a lousy clock. The intended purpose of each has been obtained. The 4 is excellent for what it is designed to do,which is to deliver the best attainable power to fuel economy ratio per liter of displacement. If you are cognizant of the fact that MB and all car companies are global,meaning that the vehicles are designed to be marketed in other countries where fuel (petrol in this case) is not abundant nor is it plentiful. I was in France last year and can tell you there are not gas stations on every corner (selling lotto and cheetos) like here in the US. Also most vehicles there were manual transmission (even the tour buses) presumably for the fuel economy and often times the terrain and tight hilly corners. So I think the design of the engine is to stay in step with the times per say. That being said of course I would agree that the immediate response and better low end torque of a larger displacement engine with more cylinders is more satisfying in most situations. At freeway or spirited backroad speeds the 2.0 and the 7 or 9 speed trans (I've driven both mine is a 15 my current loaner is an 18) deliver very well for their intended purpose. Sometimes on an engineers paper, things look better than they work in real life- I get that. Case in point my 2008 C300 with the 3.0 and 7 speed felt like a happier combo to me than my 2014 C300 with the factory detuned 3.5 and 7 speed.

Mbracer26

My w212 2014 E350 had a wrist pin issue, after the fix the car ran rough, it was much louder. glad it was a lease. Had three of them at the time and could compare them side by side.

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ItalianJoe1

Odds are they damaged a motor or trans mount during the process. It's amazing how much of a difference it makes on the normally quiet 212 chassis. I've seen people leave the mounts twisted and not install them free of tension, if they are older and used, they won't survive at all.

NewCents05

I just gave my 15 c300 @30k miles for the wrist pin repair. Wanted to get it done before the warranty is up. They gave me a 18 c300 loaner which has been fine, though not as loaded. More interesting is that it feels significantly faster than my 15. I think the 9G is definitely way snappier and just rips through the shifts almost faster than dct. No hesitations or hunting even downshifting to 1st. Also in economy mode, it shuts off the engine while decelerating above 30mph I believe. Pretty interesting tech going on and its definitely quicker but it gets rid of the "braps" I get in my 15 which is kind of a down side. With the engine slightly warm in my relatively short commute, I can get the 4 banger and 7g to sound like a mini amg by shifting around 4k rpm in s+. Sounds pretty dumb but its been a pretty fun little legal joy I get on my daily commute that I can't make happen with the 9g. For me, the 7g is more fun for a slushbox just for the "braps" and my short commute but the 9g rips like crazy and is way smoother.

chicago-guy

Thanks, I (almost) look forward to my next overnight maintenance so I can hopefully test the 9G myself -- sounds promising.

Yeah, the "braps" (good word for it) are my daily guilty pleasure, too. Fair trade-off for having to deal with the wrist pin problem.

I would be interested to hear if your repair report indicates any cylinder damage as a result of the pins, since you're at 50K. I was at about 10K when I took mine in, and I was told no damage, but concern for that was what motivated me to do the repair.

DanFC

Has anyone done the wrist pin repair on the c300 in Chicago?
If so, which MB dealer/mechanic do you recommend for this?
My c300 has about 38k miles and it's definitely making the wrist pin noise.
It's a 9/20/2014 build as well.
Thanks!

odinmd

I have a 2015 c300 4matic that I bought new 11/2014. I travel a lot so didn't end up putting that many miles on it. 8/2017, it had 8800 miles on it and I heard a noise on cold start that turned out to be the wrist pin issue and had that repaired in october (took that long for dealer here to get parts and find time in the shop). Was running fine after that, until yesterday. I was on the freeway and heard a loud clank and then a rattle and whine that got worse everytime I accelerated. Stopped after about a mile and then had to have the car towed. In the shop right now at the same dealership. I recorded the noise (posted below). Any thoughts on what it is? Is this related to the wrist pin repair? Anybody else have this issue?

benzdude

Yikes!