Lubricants are typically applied in friction reduction, cooling and sealing, corrosion and rust prevention, cleaning and dispersing, buffering and shock absorption, power transmitting, etc; 
I. Friction reduction : the energy is saved by reducing friction, while the mechanical life is elongated for better economic benefit by reducing wear and tear. 
 
II. Cooling: the friction-generated heat shall always be carried away out of the engine; 
III. Sealing: protection against leak, dust and runaway shall be provided; 
 
IV. Protection against corrosion and rusting: the friction surface shall be protected against oil deterioration or external erosion; 
V. Cleaning and dispersing: the debris arising from friction shall be cleared and cleaned. 
VI. Buffering and shock absorption: load shall be dispersed, buffered and shock absorption shall be provided. 
 
VII. Transmitting power: for hydraulic system and remote control of the motor and friction variable speed. 
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