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This hose runs from the valve cover to the intake manifold on the N54 engines - E82 135i, E90/E92/E93 335i/335xi, and E60 535i/535xi. It's part of the crankcase vent system (CVV) and carries oil vapor out of the valve cover and into the intake duct at the back of the manifold. Because of the plastic connections, it's very prone to cracking and failure and oil leaking into the engine compartment.
This is a crankcase vent hose manufactured by Rein (CRP) Automotive - the original supplier to BMW for this part, as well as many other hoses and engine parts. As the OEM it meets all of BMW's original design, fitment, and performance requirements and is TUV approved. OEM parts are the best alternative to more expensive Original BMW parts because they are virtually identical without the inflated price tag. This part has a two year warranty.
BMW Fitments:
1 Series
E82 / E88 (08-13) > 135i
E82 / E88 (08-13) > 1M (11-12)
3 Series
E90 / E91 / E92 / E93 (06-13) > 335i
E90 / E91 / E92 / E93 (06-13) > 335is
E90 / E91 / E92 / E93 (06-13) > 335xi
5 Series
E60 / E61 (04-10) > 535i
E60 / E61 (04-10) > 535xi
Z Series
E89 Z4 (2009-2016) > Z4 sDrive35i
E89 Z4 (2009-2016) > Z4 sDrive35is
$37.99
Crankcase Vent Hose, Rein - 135i/335i/535i/Z4 N54
Plastic CVV hose that cracks and leads to N54 oil leaks
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