Quote:
Originally Posted by AlanAZ
Racing is a whole different application than the street. 10W50 is too heavy for street use and will prevent proper oiling of the engine. If you look at the viscosity ranges of BMW LL-01 approved oils, the Kv100 runs from a low of 11.3 to a high of 14.1. The Kv40 viscosity runs from a low of 63.6 to a high of 93.
The maximum weight you should run for street use is 5W40, even then some are too heavy, ie. Royal Purple 5W-40 has a Kv100 of 15.9 and a Kv40 of 94.2, it's too heavy.
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Well, during the summer at the track, my oil temps went to 280+, and my car shut down the turbos. This is was while using the factory synthetic! On the highway during the summer, I would regularly hit 250+ with the same BMW 5W30! Just like the M3's S54, our N54, is no joke. I'm more worried about the cooling of the turbos than I am about slight differences in viscosity, at room temp.
Also note that your 325I's engine, is very different from my 335I's.