2003 Mercedes-Benz S430 Q&A

2003 Mercedes-Benz S430 Question: 2003 S430 base that sounds like a diesel.

The car performs great otherwise. The noise seemed to start when I put some regular gas in it one time even though I have used ultra premium ever since. Am I in big trouble? -
Answer 1
What kind of oil do you use? When was the last oil change? -
Comment 1
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. -
Comment 2
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. -