Crankcase Vent Hose, Rein - E90 325i/330i, E60 525i/530i

Vent hose from oil separator to intake manifold

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Price:
$39.99

This hose is part of the early E90, E60, and Z4 crankcase vent system on the N52 engine - from 10/2005 production. It's the plastic vent hose carrying oil vapor from the oil separator to the intake manifold. It's made by an OEM supplier to BMW.

Compared to the previous E46 system, the E90 CCV is much simpler but still prone to failure. The early E90 N52 crankcase vent system (CCV) has an external oil separator and hoses. The oil separator is bolted to the underside of the intake manifold with a hose coming from the valve cover, one going to the intake manifold, and a drain hose going to the dipstick tube. The oil separator and two of the hoses are insulated and heated to prevent sludge from building up inside the system. However, if the system is not working as intended too much oil in the intake air will lower the effective fuel octane, lead to drivability issues, and cause increased emissions. A completely blocked E90 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.

#2 in the diagram above.

BMW Fitments:
3 Series
E90 / E91 / E92 / E93 (06-13) > 325i
E90 / E91 / E92 / E93 (06-13) > 325xi
E90 / E91 / E92 / E93 (06-13) > 330i
E90 / E91 / E92 / E93 (06-13) > 330xi
5 Series
E60 / E61 (04-10) > 525i N52 (2006-2007)
E60 / E61 (04-10) > 525xi N52 (2006-2007)
E60 / E61 (04-10) > 530i N52 (2006-2007)
E60 / E61 (04-10) > 530xi N52 (2006-2007)
Z Series
E85 / E86 Z4 (03-08) > Z4 3.0i N52
E85 / E86 Z4 (03-08) > Z4 3.0si N52
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