What Is The Cause Of Bmw Oil Cap Leakage? How To Deal With It Properly?

Oil leakage from the oil filter cap is usually caused by aging or damage to the oil filter cap gasket.

The purpose of this gasket is to prevent oil leakage and dust and other impurities from entering the engine. If the gasket fails, oil may leak out. The solution to this problem is usually to replace the gasket. This process requires professional technicians to ensure the sealing after replacement. In addition, oil cap leakage may also be caused by excessive engine oil, abnormal oil pressure, aging or damage to internal engine parts, etc. Therefore, if you encounter the problem of oil leakage from the oil cap, it is recommended to go to a professional car repair shop for inspection and repair in time to prevent potential engine damage.

BMW models have actually had this problem for a long time. For example, the N13 and N20 engines already have this problem, and the current B38 and B48 engines also have this problem.

The main reasons are as follows

1. During maintenance and repair, the repairman made a mistake and failed to cover the engine oil filter cap;

2. The oil cover gasket has aged under high temperature and pressure for a long time, and the sealing is insufficient;

3. Adding too much oil will cause the engine to run at high oil pressure (lower than the alarm threshold) for a long time, which will increase the probability of oil evaporation and leakage;

4. BMW’s oil filter cap gasket is not thick enough.

solution

1. Do not add too much engine oil. You have to control this yourself, because the maintenance person will not know how much oil will be released during maintenance without measuring it. All I can say is, if you have this problem, be a little more conservative with your engine oil. For example, if the standard is 5.25L, 5L can be added.

2. Go online and buy an improved oil filter cap. Such as Part 11127582398.

3. If the improved model does not work, you can measure the inner diameter and outer diameter of the car's oil filter cap gasket yourself, and then purchase a 3 mm thick fluororubber gasket.

When oil leakage is found at the oil filter cap, it is necessary to check and solve the problem in time to ensure the normal operation of the engine.