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Re: What does ##W-## mean for motor oils?? (eom) (archive)
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Posted by Jon Caldito on January 09, 2000 at 07:08:20:

In Reply to: What does ##W-## mean for motor oils?? (eom) posted by KGY on January 09, 2000 at 04:17:38:

The "W" does not mean "weight" or "winter".
If the number is followed by a "W", it relates to the oil viscosity tested at 0degrees F.

If not followed by a "W", it related to oil viscosity tested at 212degrees F.

If rating has both number designations, it is called multi-viscosity. Ex: 20w-50

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