In the internal combustion engine, the oil pump is designed to transport oil to the rotating bearings, the sliding pistons and the camshaft of the engine by circulating the engine oil. The mission of the oil pump is to smooth the bearings, allowing the fluid bearings have the higher capacity and also being helpful to cooling the engine. A failing oil pump does a great damage to your engine. So pay more attention on it if any of following symptoms happens: if the engine in your BMW suffers from overheating a lot; if the Oil Light in your gauge panel is on; if a knocking sound from the engine comes out; if there is a noise from oil pump, there is a possibility that your oil pump is failing. You need to order a brand new oil pump online and replace it by yourself. We are glad to be your first choice for you BMW, and we deserve your trusting since we offer you all BMW genuine OEM oil pump with an attractive price.