There is an important part in the engine system named connecting rod bearing. In the system, there are three types of bearings, naming connecting rod, crankshaft or main, and camshaft bearings. The definitions of these depend on the location and function. The location of the rod bearing is inserted between the rod and the crankshaft, under tremendous strain. In the case of rod bearings, the upper half is attached to the big end of the rod, and the lower half is connected to the rod bearing cap. The function of the connecting rod bearing is to help the connecting rods rotate the crankshaft without breaking under pressure. The connecting rod bearing is made of steel or copper-lead-tin alloy, but the size of the rod bearing is smaller than main bearings. Since the connecting rod bearing is important to your engine, you'd better replace it as long as you find it goes wrong. We here offer you all BMW genuine OEM connecting rod bearings with a discounted price.