Dear All:

I've just purchased a pre-owned 2003 C240 with approx. 62,000 miles and am quite pleased with my experiences thus far. However, I donow notice a faint tapping noise which is most apparent at idling (probably becuase higher operating speeds drown out the noise).Inasmuch asthe car is still under warranty, is this something I should be concerned about? My father, who has a bit of an obsession with changing oils too often on his own vehicles, has suggested that the noise may dissipate after an oilchange, but the dealership has assured me that this was done just before resale. Others have gone as far as suggesting replacement of tappets, tensioner, and timing chaing.

Also, any assistance with regard to changing the oil would be greatly appreciated. I have already learned the hard way that this model is not equiped with a manual dipstick (or at least not one that comes standard w/ the vehicle). After looking underneath the car, I also noticed that there is a plastic shroud that covers the oil pan completely.

Any assistance with regard to these matters is greatly appreciated.

Mark

Columbus, Ohio

 

never ever changed timming tensioner or chain,on the 112 v6 engines, so you are safe,the noise you are hearin is not always there,its gonna be like on off noise,its small valve on your right hand side inside bonnet,which pulses its called a MOT,valve with two pipes on it thats for fuel return viper,thats the noise u ll keep hearin its on and off which is normall......nothing to worry about this are the most reliable engines bullet profe.