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      12-03-2019, 07:33 AM   #1189
pbonsalb
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I totally agree that thicker oil is usually best for track use. Id probably run the factory spec 10W60 if my car was a track car. But my car is a street car. Probably over 90% of M3s will never see the track.
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      01-13-2020, 04:40 PM   #1190
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What's your (& other people too) guess as to why BMW stipulate 10w/60?
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      01-13-2020, 07:45 PM   #1191
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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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      01-17-2020, 02:22 AM   #1192
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Afraid I haven't got time to read the whole thread .

Yea I guess the track use point makes some sense, but I don't really see how the change interval can be a reason seeing as plenty of 0/5w-30/40 oils can do 15k OCI.
BMW not doing 15k changes anymore?
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