Engines never rest. Each piston stroke, valve movement, and crankshaft rotation creates friction. Friction is the enemy of efficiency, producing heat that stresses parts and weakens fluids. If not properly managed, excessive heat can lower performance and shorten an engine’s lifespan. That is why so many drivers choose to buy AMSOIL synthetic motor oil in Fox Valley. At Northern Plain... https://sooperarticle.com/how-does-amsoil-synthetic-motor-oil-prevent-heat-build-up-caused-by-friction/