One of my good friends own a 1996 Mercedez E320 with the inline-6 engine. The car has about 132k on it, and he bought it used (I don't know how many miles it had then), and has had all its maintenence done by an independent MB expert mechanic (trustworthy and knowledgable he says, not a dealer mechanic). he has always used 5w or 10w-30 dino or syn.blend (he doesn't know which brands !) Now at 132k, the car needs new H-gaskets (losing a bit of oil and coolant), and a new water pump. My questions are: 1)What would be a suitable Oil (brand), and most importantly, the grade of oil he should use after getting those repairs done? will a 5w or 10W-30 continue to provide enough protection? 2)Does anybody know which weight of oil they recommend for this engine in Germany? (I doubt that it's a 10/30 oil..) 3)I've been in this car several times, and thought everytime that it sounded way too loud for MB E-class (my Tbird 4.6 is a LOT quieter at same speed). Shall I advice on a xW-40 dino/syn.blend/syn oil? (cost is not a limiting factor for him) what do you guys think? any tips advice on behalf of my friend will be most welcome...esp. from you guys who own the same model or an MB with the same/similar engines. Thanks!