I recommend using OE filters. And if I were to buy a used MBZ, first thing I would do (as I've done thrice) would be to clean the fuse box-clean all the contacts & replace all the fuses. I even went so far as to apply a small amount of electrically conductive grease to ensure the contacts remained good.
And I run Mobil 1 in all my cars (Delvac 1 in my Diesel).
Best of luck with your new car!
"If everything seems under control, you're simply not going fast enough" --Mario Andretti
1995 E500 street car
1986 Porsche 944 Turbo S track car