Original BMW Crankcase Vent Oil Separator, Cylinders 1–4, for BMW E39 M5 and E52 Z8 (2000–2003)

On the S62 V8, the Original BMW oil separator 11-15-1-406-788 vents crankcase pressure from cylinders 1 through 4 and returns oil mist to the engine on the E39 M5 and E52 Z8. Running engines push some combustion gas past the piston rings, and a crankcase vent valve such as this one releases that pressure while separating the oil mist from the vapor. The part is also known as a PCV valve or engine crankcase vent valve. It weighs 69 g, BMW has produced it since September 1998, and it is made in Germany.

Original BMW Parts carry a 24-month parts warranty.

BMW marks this part ZYL. 1-4, which ties it to the cylinder 1 through 4 bank of the S62. On this engine, that bank sits on the right side of the car, so this is the right-hand separator. The other bank uses its own part. The number supersedes the earlier 11-15-7-743-355, and BMW rates the change as exchangeable retrospectively, so it can replace the older separator on any of these cars. The separator is sold individually.

Technical Details

• Manufacturer: BMW (Original BMW part)
• Part number: 11-15-1-406-788
• BMW part name: oil separator, ZYL. 1-4
• Position: cylinders 1–4, right side
• Weight: 69 g (0.2 lb)
• Production start: September 1998
• Supersedes 11-15-7-743-355, exchangeable retrospectively
• Made in Germany
• Sold as one piece
• Warranty: 24-month parts warranty

Common Questions

Does this separator fit both sides of the engine?
No. BMW assigns it to cylinders 1 through 4, which is the right-side bank on the S62.

My car has 11-15-7-743-355. Is this the replacement?
Yes. BMW superseded that number with this part and rates it as exchangeable retrospectively.

Is the M5 part the same as the Z8 part?
Yes. Both S62-powered cars use this separator for cylinders 1 through 4.

S62 owners can count on PMB for factory BMW parts that match their car.

Fitment & Compatibility

Confirm your model year and submodel against the table below before ordering. With over 20 years of parts and fitment experience, PMB Performance can match this to your VIN.