Genuine OEM BMW Crankcase Oil Pan, part number 11137800322. This is the main reservoir for engine oil, located at the bottom of the engine. It is designed to hold the correct volume of oil and features precise mounting surfaces for a leak-free seal with the engine block and oil pan gasket. The oil pan also often includes a drain plug for oil changes. Genuine OEM oil pans are made to exact specifications to ensure proper fit, durability, and oil containment, which is essential for engine longevity.