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Old 06-18-2012, 03:45 PM
PatrickGSR94 PatrickGSR94 is offline
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Join Date: Jun 2012
Posts: 32
Also the "W" does NOT stand for "winter".

From SAE J300 p.2:
"Two series of viscosity grades are defined in Table (1): (a) those containing the letter W and (b) those without. Single viscosity grade oils with the letter W are defined by maximum low temperature cranking and pumping viscosities and a minimum kinematic viscosity at 100C. Single grade oils without the letter W are based on a set of minimum and maximum kinematic viscosities at 100C and a minimum high shear rate viscosity at 150C. The shear rate will depend on the test method. Multi-grade grade oils are defined by both of these criteria....
The W is just a designation of one type of testing vs another.
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