good simple explanation.  Thanks!

--FT

On 8/6/19 10:35 AM, Mitch Haley via Mercedes wrote:
Viscosity is measured at 100°C.
IIRC, the W rating is measured at 0°C, and based on the 0°C viscosity of a 
comparable dino oil.
So a 10W40 had the viscosity of SAE40 at 100C and the viscosity of SAE10 at 0C.
Below 0°C, a 15w50 might be thinner than a 10w30.

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--FT


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