Genuine OEM BMW oil sump, part number 11138595453. This component is the lower reservoir of the engine that holds the lubricating oil. It is mounted to the bottom of the engine block and collects oil returning from the engine's lubrication system. Genuine OEM oil sumps are manufactured to precise specifications, ensuring correct fitment, proper sealing to prevent leaks, and adequate capacity for the engine's oil supply, which is crucial for maintaining engine health and preventing damage.