In Reply to: Anyone using CASTROL Syntec 5w50 oil? (more) posted by Bob ///M3 on April 30, 2000 at 16:46:40:
: I don't much care for the "30" in the new BMW oil but I'm also not too wild about the "45" spread of the CASTROL 5W50 either. I guess the "45" spread will be okay because the new M5 uses only CASTROL (BMW labeled) 10W60 which has a "50" spread!
: Any comments bood or bad about the CASTROL 5W50?
: Bob ///M3
The M5 has the governor to limit rpm's top range when the engine is cold. I think as long as you keep the rpm range low before the car warms up, a wide spread of oil viscosity should pose no problems.