OEM#11377514007 Ignition Spark Plug Pipe Fit for BMW E46 E81 E87 E88 118i 120i 316i 318i X1 X3 Z4

The working principle of the camshaft rear cover oil seal is to prevent lubricating oil leakage through a sealing device and to stop external dust and impurities from entering the engine interior.
The camshaft rear cover oil seal is located at the rear end of the engine camshaft and is a crucial sealing device. Its main function is to prevent the leakage of lubricating oil and to stop external dust and impurities from entering the engine interior. The oil seal on the camshaft rear cover is an important line of defense in the engine lubrication system. If this line of defense malfunctions, it will not only lead to a decline in engine performance but also may cause more serious mechanical failures.