Crankcase Vent Return Pipe - E46 E39 E60 X3, X5, Z4

Secondary vent hose from CCV to top of manifold

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Price:
$13.69

This hose is part of the E46, E39, E60, X3, X5, Z3, Z4 Crankcase Vent system on the M52TU and M54 engines. It's a complex system with multiple rubber and plastic hoses running betwee the valve cover, oil separator valve, and the intake manifold. This particular line is a secondary hose from the oil separator valve to the intake manifold. There are two versions of the E46 CCV - standard original and a cold climate version. This hose is part of the standard system and is made by an aftermarket supplier. 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 system 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.

A failed crankcase vent hose is rarely the only thing wrong with the system and this is a good opportunity to evaluate the rest of the system. Chances are if oil sludge is present on the inside of any of the lines that the oil separator valve will also be coated with sludge. Kits are available to overhaul the whole system.

BMW Fitments:

3 Series
E46 (99-05) > 323Ci
E46 (99-05) > 323i
E46 (99-05) > 325Ci
E46 (99-05) > 325i
E46 (99-05) > 325xi
E46 (99-05) > 328Ci
E46 (99-05) > 328i
E46 (99-05) > 330Ci
E46 (99-05) > 330i
E46 (99-05) > 330xi
5 Series
E39 (97-03) > 525i
E39 (97-03) > 528i
E39 (97-03) > 530i
5 Series
E60 / E61 (04-10) > 525i M54 (2004-2005)
E60 / E61 (04-10) > 530i M54 (2004-2005)
X Series
E53 (00-06) > X5 3.0i M54
X Series
E83 X3 (04-10) > X3 2.5i M54 (2003-2005)
E83 X3 (04-10) > X3 3.0i M54 (2003-2006)
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 2.3
E36/7 / E36/8 Z3 (96-02) > Z3 2.5
E36/7 / E36/8 Z3 (96-02) > Z3 2.8
E36/7 / E36/8 Z3 (96-02) > Z3 3.0
Z Series
E85 / E86 Z4 (03-08) > Z4 2.5i M54
E85 / E86 Z4 (03-08) > Z4 3.0i M54
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