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Moving parts in an engine are generally metal on metal and in a car engine everything fits very snugly to eliminate knocking and engine rattle, but this causes extreme friction between the metal surfaces.

if you were to run your car without oil, much of the power would be lost to friction and eventually the metals will melt and fuse due to the intense heat and friction. oil serves and a lubricating coat covering most moving engine parts (where metal on metal friction is concerned) so that the metal only has the friction of the oil to cope with, which is negligible.

Overall it ruduces running heat, engine wear and increases efficiency, engine life and performance.

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15y ago

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