Thread: BMW Engine Oil
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Old 11-09-2012, 08:01 AM   #50
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Joined: Jul 2008
Location: The great state of confusion
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Thanks Steve ... that actually makes sense

This is an oil thread and we have some experts here, so for my next stupid oil question:

I've seen a number of folks say you can mix different weights of oil together if you want your own viscosity "blend".
For example the brand of oil recommended in the BMW manual is the Castrol EVO-xtra, synthetic blend oil and it is available in 20W-50 and 10W-40.
If you took equal volumes of each and mixed them would you "really" get something that behaved similar to a "refinery produced" 15W-45 ?
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