Quote:
Originally Posted by cruisingdownthestreet
i did my research and Mobil 1 SAE 0w-40 is longlife-1 (LL-1) compatible for both my dad and my BMW.
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the user manuals specifies 5w30/5w40.
a 0w shears quicker then a 5w and regardless of the "winter" W designation, a thinner oil cannot protect your engine at full operating temp as well as a 5w would.
a 5w will make your engine run quieter and smoother, as well as maintain temps under a variety of driving/ weather conditions.
trust me, you shouldnt use anything else but specifically what the manual specifies. all this 0w drama was started with the strict CAFE requirements in north america for emissions and fuel economy purposes. I suggest you read up on CAFE and dont fall for this bullshit..