the one i use in my shop is either mobil 1 15/50 or 0/40
depending on the car. mercedes recommends mobil 1
on all their cars.
15/50 was fine up to 2004 cars when mb changed to 0/40.
i would recommend you use mobil 1 15/50.
readily available and covers you big time. good for
7,500 or once a year. just don't forget the rest of your car.

george