I can hear a little "whine" noise coming from the rear end between 20-30 mph. We bought our car used with 60 k miles and otherwise is in perfect condition. Car had history of a rear end seal leak which was fixed. Maybe I am fixated on that barley audible sound but it is starting to bug me. I wish i could listen to another c230 to see if in fact it is normal noise for this car. Question: Does this car have known problems with the rear end? All my recent cars have been front wheel drive so haven't heard that sound. We didn't hear that noise when we bought the car but maybe just didn't notice it before. Could I just be hearing normal rear end noise? Thanks for your input..
Larry