Thread: BMW Engine Oil
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Old 10-18-2012, 10:11 AM   #35
JRWooden
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Joined: Jul 2008
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I've read in several places that you can mix weights of oil and that you roughly end up with the average for the blend.

Officially BMW (was) recommending Castrol Act-Evo Xtra 10W-40 which is a synthetic blend and is what I have been using ... that particular oil is available in 10W-40 and 20W-50

I've read in several places that you can mix weights of oil and that you roughly end up with the average for the blend.
I've been unable to find any references that says mixing viscosities of the same brand of oil is "bad" ...

If I put 1.5Qt of 10W-40 and 1.5Qt of 20W-50 in my bike at the next oil change do I end up with ~15W-45?

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