The 350 engine is equipped with two oil pumps. A pressure pump provides reliable lubrication for the crankshaft, piston, counter balance shaft and valve train, while cooling the ignition and lubricating the clutch. A scavenger pump draws oil from the crankcase to lubricate the transmission. This also creates a small vacuum within the crankcase, which increases engine performance. For MY 2015, the oil pump suction screen has new O-rings that increase durability under extreme conditions and over time.