Which manufacturer produces the BMW valve cover?

From the original N52, N54 and N46 engines to the later N55 and N20 engines, there is a tradition of oil leakage from the valve cover, especially on N20 and N55 engines, which have supported many repair shops.

The main reason is that the oil temperature is very high when the engine is running at high speed. With the increase of temperature, the internal pressure gradually becomes higher. Long-term contact between valve cover and engine oil will reduce the toughness and aging of valve cover gasket, resulting in excessive clearance, reduced sealing performance and deformation and oil leakage.