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Old 04-08-2010, 06:48 PM
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Location: Belmont, CA
Join Date: Dec 2009
Posts: 72
Mein Auto: '96 328i sedan
the w just indicates the score on the "w" test, which is basically really cold winter conditions. In the heat the w rating doesn't really matter, and as long as your cooling system is doing its job, the viscosity should depend on the engine. I would stick to a 40, although I personally am going to start using Redline 5w30. The w rating depends on the climate, 5 or 10 is fine, Mobil 1 0w40 is very popular for these cars though.
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