Hello all, This question probably gets asked alot on here but I cant seem to get a solid conclusion. Which oil is the best to use for this particular engine? I can get the oil and filter through work you see and I have a mate who works in a German specialist garage who will change the oil for me. So I was going to treat the car too some proper good quality oil! Question is which one!! Do I stick with manufacturers which says Mobil 1 or shell helix?? Any opinions or help would be great!