5 w 40 but would 0 w 40 be ok too. I mean mobil1 doesnt make 5w40. Some guy i asked at a store said not to use 0 w 40. So now i am completely lost . he said its too thin. I looked at mobil1 website and they use it on 98 and new mercedes and porshes. Can someone shed some light on this matter. Is it safe or should i order 5 w 40 from the dealer????????