2003 S430 base that sounds like a diesel.

Thanks for your reply. I do not know what kind of oil is in there or how old it is but it looks dark purple and syntietic. I bought the car 4000 miles ago (112k now). Because I did not know the answer to that question I have scheduled an oil change at a Mercedes shop for tomorrow.

You're welcome. You have to use the right kind of oil in those vehicles. They're very sensitive. I have the same car. You have to baby them.