The oil will dissipate the heat built up through the crankcase. The less oil present, the less opportunity there is to dissipate heat, thereby increasing the operating temperature of the engine. Too little oil and the engine runs so hot that metals actually begin to melt. And when you go to change the mower's oil and drain the old, don't forget to put more in. It happens, Palmer says.
People make mistakes.
Everybody's not using their lawn mower to make a living. Use fresh gasoline Old gas goes stale in the tank. Wash your mower After it cools down, hose it down, washing off the grit and grass. The No. 1 culprit of destroying an engine is dirt. A little preventative maintenance goes a long way.