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is this a fault?

hi i have just bought a mercedes c180 kompressor 2003 model, on start up there is a knocking sound coming from the engine,but it dissapears after a few seconds ,can any one tell me if this is a fault or not,thanks?
brian thomas cheadle, April 2009
Any service history with the car? When was the oil and filter last changed.
I would start with changing the oil and filter and make sure correct oil is used and a Mercedes-Benz oil filter

Maurice, April 2009
possible hydraulic tappet fault .one or more tappets are on there way out, wouldnt expect this on a merc unless it was high mileage.best get it looked at

dino, April 2009
hi brian the knocking noise possibley you are waking up the hamster hope this helps

james, April 2009
link Click here to see other fixes for Mercedes C180.