NEVER OPERATE OVERHEATED ENGINE FOR ANY LONGER TIME.

Excessively high oil temperature is a significant factor spoiling the lubricating oil.
Always operate the engine at temperature within the operating range of the water temperature gauge.

NEVER PERMIT WATER OR DIRT TO CONTAMINATE THE LUBRICATING OIL.

Oil contaminated with water or dirt loses its lubrication effects.
When replenishing lubricating oil, never permit water or dirt to enter the oil container.

REPLACE THE FILTER ELEMENT.

Dirt or foreign matter in oil is removed by the oil filter element. The element will become clogged by dirt after a certain period of time and will not function properly. Be sure to replace the element every 250 hours as indicated on the service meter.

CHANGE THE LUBRICATING OIL.

Change the lubricating oil at the specified intervals, since it will lose its lubricating effects after a certain period of time.
The oil change intervals should be every 500 hours ( on the service meter ) for the naturally aspirated engine and every 250 hours for turbocharged engines.
When using the Class-CC or -CB lubricating oil, the above intervals should be reduced to 1/2 of the regular intervals.

USE THE SPECIFIED LUBRICATING OIL.

Replenishing oil should be that of the brand specified by KOMATSU which has the properties required to withstand the severe operating condition accompanied with construction machinery.

USE A LUBRICATING OIL OF THE PROPER VISCOCITY.

The lubricating oil should be of the proper viscosity to ensure smooth lubrication of the engine. Either SAE 30 or SAE IOW should be used depending on the atmospheric temperature, because the viscosity varies according to the temperature.