Rationale:This proposed revision would change the minimum
high-temperature, high-shear rate viscosity for SAE 0W-40, 5W-40
and 10W-40 viscosity grades to 3.5 mPa's from the current limit
of 2.9 mPa's. The rationale is that moving from an SAE xW-30 to
an SAE xW-40 should provide increased bearing oil film thickness in
an operating engine, which is not fully reflected in the current
version of the Standard. This proposal was developed by a working
group within the SAE Engine Oil Viscosity Classification Task
Force, and the EOVC membership supported its move to formal ballot.
The working group analysis of aftermarket databases covering North
America, Europe and Asia-Pacific indicated a minimal impact on
commercially available engine oils (<1% affected by the proposed
Also known as: SAE J 300
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