The lubrication system is equipped with an electrical oil pump and a shaft driven main lubrication oil pump. The electrical pump serves as a pre-lubrication oil pump and as a stand by oil pump in case of break down of the shaft driven main pump. The pumps take suction from the diesel engine lubricating oil sump and discharges though a freshwater cooled oil cooler and a duplex filter. The oil sump can be refilled from the lubricating oil storage and the oil can be drained to the sludge tank by using the electrical oil pump.The electrical oil pump can be operated in manual or in automatic mode.