Thread: Viscosity debate....
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Old 05-08-2008, 06:22 AM
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Quote:
Originally Posted by lowmileage View Post
I'm not certain but the "spread of the numbers theory" might be different (may not apply as in the case for dino oils) for syn oils. I know it is for M1 5w-30 which in a dino contains more than the ideal mix of VII's but is good in the M1 instance.
The numbers spread is called 'viscosity enhancement' IIRC, and I also believe it's pretty much a non-issue for synthetic oils. Probably less of an issue with non synthetic oils than it used to be as well.

I always heard 30 is the highest you want to go with the spread, but I've been using 15/50 Mobil One in Alfa motors for years with no problems.

bs
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