Oil Separator Set, URO - F10 550i, F13 650i, F02 750i, E70 X5M, E71 X6M (N63A, S63A)

This part is listed by BMW as BMW part number 11158636540 (11 15 8 636 540) and is described as URO Oil Separator Set for early N63 and S63 V8 engines in 2011-2013 F10 550i, 2012 F12/F13 650i, 2009-2012 F02 750i, 2010-2013 E70 X5M, 2010-2014 E71 X6M models. Each V8 engine valve cover contains an oil separator.

Only for first-generation N63 and S63 engines.

Not for F06 650i Gran Coupe models.

New valve cover gaskets are included. For additional gaskets see Related Items below.

The oil separators are 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, crankcase vent, CCV, 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.

This part is manufactured by an aftermarket supplier of European auto parts, including many driveline components. While not carrying OEM status, this part follows the design of the original very closely and uses similar materials. An aftermarket part may even have the same TUV approval as its OEM counterpart. The brand may even be OEM to another manufacturer besides BMW. This aftermarket brand has a two year warranty - the same as Genuine BMW and OEM brands.