Genuine OEM Audi Oil Pump Cap, part number 079115638C. This small but essential cap seals an opening on the engine's oil pump, preventing oil leaks and protecting the internal components of the lubrication system from contaminants. It is located directly on the oil pump assembly. Weighing only 0.002 kg, it is typically made from a durable, oil-resistant plastic or rubber. Using a genuine OEM cap ensures a perfect seal and material compatibility, which is critical for maintaining proper engine oil pressure and preventing costly damage to the engine.