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      01-13-2020, 06:45 PM   #1191
Z K
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Drives: E90 M3, G20 M340i
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Quote:
Originally Posted by Assimilator1 View Post
What's your (& other people too) guess as to why BMW stipulate 10w/60?
This was mentioned much earlier in this thread but BMW most likely used 10w60 because of the long oil change interval they were doing at the time the M3 was introduced (15,000 mile oil changes). They also do it because they want the engine to hold up to high track temperatures that the engines get exposed to.

But if you are not doing either, I don't see why you couldn't run a thinner oil for every day use.
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