I purchased my '06 c280 4matic almost 2 months ago and I have had no noises or problems until now. When I turn her on, the engine sounds louder than it ever was before, and it only stays like that for a couple minutes then goes back to normal. It been like this for a few days now. I have no clue as to why it's louder because I have done nothing different except for put 92 octane in when I have consistently filled with 93; but it doesn't make sense that the octane would make a difference. Anyone have a clue as to what going on? Thanks.
Anyone help figure this out?
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The octane should not effect your engine to the point where it is louder. I know on my w203 if I turn her on and leave it running it gets louder due to the fans turning on then off. Also it is common to here a ticking for a short period of time, which will eventually stop.
Thanks. 
I think I am just being paranoid from hearing it once now every noise is a bad one. But I am taking her to the dealer Tuesday anyways to get a diagnostic done.
I think I am just being paranoid from hearing it once now every noise is a bad one. But I am taking her to the dealer Tuesday anyways to get a diagnostic done.
I complained at the dealer along time ago about the ticking noise. They said that they padded it with something to quiet it down and after that it was a little less noisy. All of our cars make that same noise though.
Yeah, my bf drove my car yesterday and when he got home he said when he started it, he was hearing a popping noise like it was backfiring and a whistling from the engine. I would rather spend 100 bucks to find out its nothing than to be paying so much more if there is a problem. I am mad because I just got this thing not even 2 months ago.
Are you still under warranty?
Yeah, that's why I'm bringing it to the dealer. I was told that everything was just replaced and the vehicle was seviced right before I bought it so that is mainly why I am frusterated. They wont give me the service records for my car, keep making excuses and telling me they'll send em to me but I have yet to get them. The carfax doesn't say what was done to the car just that is was serviced so I don't know if it ever had problems. It was a lease before I got it. Someone told me I could find service records online with my vin but they didn't know the website so who knows.
Well atleast it is under warranty still. That way every time you bring it in, it won't cost you anything at all. As far as the service records go, I also tried to get them from the dealer. I was told that I could not get them because they do not give out that information.
Yeah they suck.
If the service was done at the dealer, any dealer can pull up the service records. You might also be able to get them from 800-FOR-MERC. It is possible they are trying to hide problems from you, it is worth checking. This is one of the advantages to buying from a private party: my car came with full service history, including the less flattering things that had been done (hood repainted due to serious scratches from a garden hose).
Thanks for the info. If I can't get them soon I will try that.
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