The grade of motor oil is less often understood than the weight. In this case, "SP" can be used in cars that call for that grade or car's that call for anything alphabetically prior like SN.

Smaller oil galleries can easily cause reduced flow and lower pressure when a heavier grade such as 5W20 or 10W30 is used, just as the main crankshaft and piston-rod bearings are also designed ...

For those unfamiliar with motor oil grades, close to 52% of the passenger car motor oils currently in use are SAE 5W-30 grade products. Second and third are 5W-20 and 10W-30, with an estimated 23 ...

Liqui Moly, an oil manufacturer, writes that viscosity grades were extended downward to 0W-16, 0W-12, and 0W-8 by the Society of Automotive Engineers in 2015. Advertisement ...