What Causes Oil Leakage from the BMW Valve Cover Gasket?

1 Answers
OAllie
07/30/25 4:56am
BMW valve cover gasket oil leakage causes: Oil leakage at the valve cover gasket may be due to uneven screw pressure, excessive screw pressure, deformation of the valve cover gasket, blockage of the crankcase forced ventilation valve, or poor quality of the sealing ring and sealant. The valve cover gasket is primarily used to seal and prevent oil leakage. Since the material of the valve cover gasket is mostly rubber, it inevitably hardens and ages over time, leading to oil leakage. The BMW 5 Series is a large and mid-size sedan under BMW. Taking the 2021 525Li Luxury Package as an example, its body dimensions are 5106mm in length, 1868mm in width, and 1500mm in height, with a wheelbase of 3105mm. The body structure is a 4-door, 5-seater sedan. In terms of power, the 2021 525Li Luxury Package is equipped with a 2.0T inline 4-cylinder engine, delivering a maximum power of 135kW and a maximum torque of 290Nm, paired with an 8-speed automatic transmission.
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