Hi Guys, this topic has probably been covered before... at the moment I use 0w-40 oil in my -88 MB urq (the engine has covered about 20-30 000km after total rebuild) What is the best viscosity for the MB engine? Should I perhaps use a 5w-50 oil, I have heard that this viscosity is more suitable for a highly tuned turbo engine. Cheers, Johan Hisinger Helsinki, Finland