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Is There an Oil Viscosity Lower Than 0W?
 
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Question:
Is There an Oil Viscosity Lower than 0W?
Kind of a weird question but is it possible to have an oil with a viscosity lower that 0W?
-- Sam David, Seymour, WI
Answer:
Yes, but currently the SAE J300 viscosity specification does not define an oil below 0W. The limiting factor for such an oil would be the availability of base oil to accomplish this viscosity. Such an oil would have a cranking viscosity below -35C and pumping viscosity below -40C. That’s pretty cold!! Brrrrrrr.
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