So I bought a used 08 C300 and the first few seconds after I start the car, the engine sounds a little rough and then the begins o get quiet. Has anyone else noticed this on the start up.

When I bought it, it was listed as a dealer car with 19k in mileage.

 

My 2008 has done this from day one, this has been discussed already. Not to be mean but try search!

 

Its not mean, Just a nice welcome to club!

 

Do you mean knock-knock-knock-knock as oil pressure comes up?

 

That's sounds right, its just a few seconds of what sounds like rough idle and then it disappears and smooth's out. I just wasn't sure if it was and enginge issue.

 

Like this, which seems to be exactly what I was asking about. Thanks RLE for giving me the item to look up!

https://mbworld.org/forums/c-class-w...ine-noise.html

 

Now that you have read all those posts (including mine) going back two years plus, you can see that the noise is more than common and has caused no problems that have been reported.

So, forget it.

BTW, mine still makes the noise on most starts at 21K miles.