i know a few of us C300 owners have had a problem with the engine feeling "gritty" while accelerating and/or coasting. Has anyone had this addressed by the dealer? I took mine in and they said that theres nothing wrong with the car Sometimes it feels pretty dang rough, however it idles pretty smoothly.

 

I notice the same when my engine is cold. But once it warms up, it goes away.

 

Same thing with mines, it a little rough online when I start it up in the morning, you can actually hear from the exhause also, but after about 10 seconds latter it all gone.