Another weakness was in the oil pump drive. These holes must match with the outlet of the oil pump. He started 30th and finished 29th after suffering oil pump failure early in the race. Mechanics found it was a broken pulley operating the vehicle's oil pump. The duplex chain drives the distributor and the oil pump shafts. It had different camshafts and a redesigned sump and oil pump. No change to the oil pump nor coolant pump circuits was needed. The GM versions are not equipped with an oil pump. The car had an oil pump failure after 121 laps. Conventional wet sump engines have one oil pump. Aftermarket performance parts makers also make oil pump extension drive collars to rectify this problem. The oil pump within the transmission was also deleted. A separate single row chain drives the oil pump. The engine features a compact balancer shaft module with an integrated oil pump. This can make for a very interesting hydraulic-control oil pump.