BMW S54 CPV Repair Kit Replacement O-Ring for E46 M3 E36 E85 E86 M Coupe M Roadster
BMW S54 CPV replacement o-ring E46 M3 E36 E85 E86 M Coupe M Roadster MZ3 MZ4 Replacement o-ring for Constant Pressure Valve
BMW constant pressure valve replacement o-ring made from Viton to replace the leaking o-ring the factory made of a weaker material.
The S54 motor commonly develops a leak in the constant pressure valve (CPV) at the right rear of the motor after a few years. BMW does not sell the o-ring separately and S54 owners are forced to buy the complete pressure valve assembly at the cost of $40 to $60.
