Crankcase Vent Valve / Oil Separator Kit, Cold Climate - E46, E39, E60, X3, X5, Z3, Z4

Genuine BMW 3-piece CCV kit - insulated oil separator and attached hoses

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This is a basic E46, E39, E60, X3, X5, Z3, Z4 Crankcase Vent Kit that contains the oil separator valve and attached hoses on M52TU and M54 engines. It's a Genuine BMW kit and comes with a two year warranty. This kit includes -
  • insulated crankcase vent valve / oil separator (Cold Climate version)
  • vent pipe
  • connecting line
There are two versions of the E46 CCV - standard original and a cold climate version. This kit includes parts for the upgraded Cold Climate CCV system. The Cold Climate CCV has foam insulation around the hoses and oil separator valve and does a better job of trapping heat inside to warm up the oil faster and prevent condensation. The cold oil leads to sludge or even ice that blocks operation of the oil separator. The Cold Climate CCV is recommended not only for colder regions but also if the car is driven very short distances (< 10 miles) and the engine never gets to optimal temperature.

The E46 crankcase vent valve is responsible for separating oil from the air inside the engine and air intake. Liquid oil is returned to the oil pan while oil vapors are sent to the intake manifold to be burned up during the combustion cycle. It's also known as a a PCV, CCV, oil separator, and a cyclonic separator system. Too much oil in the intake air lowers the effective fuel octane, leads to drivability issues, and causes increased emissions. A completely blocked CCV has the potential for very serious engine failure (hydrolock) if liquid oil ends up in the intake. Signs of a failing CCV include: whistling noises in the intake, blueish smoke in the exhaust, high oil consumption, and thick white or yellow gunk under the oil cap.

The E46 crankcase vent system is complex with multiple rubber and plastic hoses running betwee the valve cover, oil separator valve, and the intake manifold. A failed crankcase vent valve (CCV) is rarely the only thing wrong with the system. The hoses are prone to clogging from oil sludge, cracks, and leaks so we recommend a complete overhaul at the same time or at least a thorough inspection of the rest of the system. Regular heavy acceleration and runs to redline and frequent oil changes will also help keep the system working properly. The lower return line from the CCV to the dipstick tube is sold separately but recommended because the plastic connector often breaks during CCV replacement.

BMW Fitments:

3 Series
E46 (99-05) > 325Ci
E46 (99-05) > 325i
E46 (99-05) > 325xi
E46 (99-05) > 330Ci
E46 (99-05) > 330i
E46 (99-05) > 330xi
5 Series
E39 (97-03) > 525i
E39 (97-03) > 530i
X5 Series
E53 X5 (00-06) > X5 3.0i M54
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