What is oil shear and how does it affect oil viscosity Motor oil basics Motor oil lubricates, carries away heat, and provides a cushion between metal parts to prevent metal-to-metal contact. Oil is constantly pumped into the clearances between the crankshaft and crankshaft bearings, crankshaft and rod bearings, camshaft and camshaft bearings, camshaft and lifter, and camshaft and high-pressure fuel pump. Oil viscosity basics Fact 1) All oil (motor oil, olive oil, canola oil, etc.) thickens when cold and thins when heated. Fact 2) Viscosity is defined as a fluid’s … Read More

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