Description: Genuine GM Engine Oil Pump, part number 12640448. This GM OEM engine oil pump pressurizes and circulates engine oil to the bearings, camshafts and valvetrain, keeping moving parts lubricated and protected from wear. Made by General Motors to original equipment standards for correct fit, finish and durability—no guesswork with aftermarket parts. Verify fitment using your VIN or GM part number 12640448 before ordering. Shipped from Gateway Buick GMC, an authorized GM dealer.