When your CPV O-ring fails it causes a slow oil leak on the passenger side of the engine, making an oily mess that frequently resembles a rear main seal leak. Replacing the CPV with an upgraded o-ring ensures a long-term solution to this common problem.
The factory o-ring over time fails from heat cycling and oil exposure due to the Buna rubber used in OEM o-rings, while the included Viton Fluoroelastomer is resistant to a much higher temperature to ensure prolonged life without leaking.
On M52/S52-equipped BMWs, the factory crankcase ventilation (CCV) system is a notorious weak link. Between brittle plastic corrugated hoses that crumble from heat soak and an internal cyclone diaphragm prone to tearing, a failing CCV leads to massive oil consumption, vacuum leaks, and that dreaded "howling" whistle.
This kit addresses these issues with all new components and hardware. Both oil separator hoses, the cyclone separator itself, the mounting grommet, and the retaining bolts are included. Servicing this system is guaranteed to restore performance lost as a result of worn CCV components.
Kit includes:
Cyclone Separator/Crankcase Pressure Regulator Valve High Performance Silicone Breather Hose Return Hose Mounting Grommet Hex Bolt (3)
This product was last offered at the strikethrough price on
09-09-2026
This product was last offered at the strikethrough price on
09-09-2026
This product was last offered at the strikethrough price on
08-07-2026
This product was last offered at the strikethrough price on
08-07-2026
The plastic hoses and oil separator can crack or become faulty, leading to vacuum leaks or oil leaks. This is caused by the stress the plastic components are exposed to during heating and cooling cycles, especially if the vehicle is not brought up to operating temperature during driving in cold weather climates.
This kit includes the needed hoses, oil separator, mounting grommet, and hardware.
Fits the following BMWs:
2000-2003 E39 BMW 530i
This product was last offered at the strikethrough price on
07-14-2026
This product was last offered at the strikethrough price on
07-14-2026
This product was last offered at the strikethrough price on
08-13-2026
This product was last offered at the strikethrough price on
08-13-2026
This product was last offered at the strikethrough price on
10-28-2026
This product was last offered at the strikethrough price on
10-28-2026
This product was last offered at the strikethrough price on
06-15-2026
This product was last offered at the strikethrough price on
06-15-2026
This product was last offered at the strikethrough price on
09-29-2026
This product was last offered at the strikethrough price on
09-29-2026
This product was last offered at the strikethrough price on
07-07-2026
This product was last offered at the strikethrough price on
07-07-2026
The rubber hoses and oil separator can crack or become faulty, leading to vacuum leaks or oil leaks. This is caused by the stress the components are exposed to during heating and cooling cycles, especially if the vehicle is not brought up to operating temperature during driving in cold weather climates.
This kit includes the needed hoses, oil separator, and hardware.
Fits the following BMWs:
1999-2006 E53 BMW with M62 4.4L 4.6L
