Hi everyone. I've been reading and searching for the answers to my questions but haven't found any that provide much comfort. I have a 2007 335i. Normal operating oil temps for this car are ~240 degrees F. But on the track the oil gets warm...really warm. At Willow Springs Raceway at my last driving school oil temps reached 285-290 degrees.
BMW recommends the BMW 5w30 sold at dealers. M1 0w40 is also approved but read it tends to shear rapidly and the engine runs warm. The owners manual calls for 5w30 or 5w40 depending on climate but none of the US dealers seem to carry 5w40.
After reading this http://www.animegame.com/cars/Oil Tests.pdf I'm leaning towards Royal Purple 5w40 but there's also Amsoil 5w40, Redline, Valvoline Synpower 5w40 and others. Amsoil claims BMW LL-04 but isn't approved while Synpower is BMW LL-04 and awiting final approval.
Do any of you have any thoughts or recommendations? Thanks for the input.
BMW recommends the BMW 5w30 sold at dealers. M1 0w40 is also approved but read it tends to shear rapidly and the engine runs warm. The owners manual calls for 5w30 or 5w40 depending on climate but none of the US dealers seem to carry 5w40.
After reading this http://www.animegame.com/cars/Oil Tests.pdf I'm leaning towards Royal Purple 5w40 but there's also Amsoil 5w40, Redline, Valvoline Synpower 5w40 and others. Amsoil claims BMW LL-04 but isn't approved while Synpower is BMW LL-04 and awiting final approval.
Do any of you have any thoughts or recommendations? Thanks for the input.