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EOP (Engine Oil Pump) is installed on vehicle engine and is connected to engine crank shaft. It drives along with engine speed and supplies lubricants into the engine under constant oil pressure. It has function of noise occurrences control and durability improvement caused by engine lubricant effect.

Generally, gear type or vane type is in use.
The main function is engine oil supply into engine system for lubrication action.
The variable displacement system (Mechanical, Electrical) has applied for better fuel efficiency.