Oil cooled pistons offer some important benefits to diesel engines. Oil is sprayed from jets or nozzles mounted in the engine crankcase directly up into the pistons through a hole effectively cooling and lubricating the upper crown portion of a piston. The oil flows through the top of the piston and exits from a hole in the other side of the piston. The result is increased durability and engine life and a decrease in engine emissions like NOx, CO and HC.
