What Causes Oil Leakage from the Valve Cover of a BMW 5 Series?

1 Answers
McKing
07/29/25 11:30pm
Reasons for oil leakage from the valve cover of a BMW 5 Series: Poor Quality: Inferior product (accessory) quality, materials, or craftsmanship, with structural design issues. Improper Assembly: Unclean mating surfaces of components, damaged or displaced gaskets, or failure to follow installation procedures. Loose Fastening Nuts: Uneven torque on fastening nuts, stripped threads, or loosening and falling off, leading to operational failure. Aging Sealing Materials: Excessive wear over prolonged use, aging, deterioration, or deformation of sealing materials. Inappropriate Lubricant Level: Overfilling of lubricant, excessively high oil level, or incorrect fuel addition.
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