Genuine OEM Ford Oil Drain Screw Seal, part number 1145962. This seal, often a copper washer, is placed on the oil drain plug to create a tight seal against the oil pan, preventing oil leaks. It is designed to compress when the drain plug is tightened, ensuring a leak-free connection. Maintaining a proper seal is crucial for keeping the correct oil level in the engine and preventing oil loss. Genuine OEM seals provide the correct material properties and dimensions for a reliable seal.