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Anyone help figure this out?

976 Views 10 Replies 4 Participants Last post by  C_klasse2124
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.
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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.
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