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Oil/fuel


betatechno95
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If you don't have enough oil in your fuel, the friction from the rings and piston rubbing against the bore greatly increases. This friction can get the rings and bore and piston very hot. Aluminium expands more with temperature rise than steel and cast iron so as your bits get very hot, the clearance between the piston and the bore becomes too small. If this process goes far enough the parts may stick (sieze) together. Even if they don't get to the point of seizing, running an engine with insufficient oil will make the rubbing bits wear out faster than otherwise.

The heating due to rubbing friction has nothing to do with the heat produced when fuel is burned in the engine. The amount of oil in your fuel has only a tiny effect on the amount of heat produced by combustion.

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