Original BMW Cylinder Head Oil Non-Return Valve for BMW 3 Series, 5 Series, M3, X3, X5, Z3, and Z4 (1991–2006)

Fitted to the cylinder head oil supply of BMW's M50, M52, M54, M56, S50, and S52 engines, Original BMW non-return valve 11-12-1-735-180 is a one-way oil valve for the 3 Series, 5 Series, M3, X3, X5, Z3, and Z4. A non-return valve lets oil pass in one direction and closes against flow trying to come back the other way. BMW's name for the part is simply non-return valve, and it weighs 18 g (0.63 oz). It is made in Germany and sold individually, one valve per piece. Production of this number began in April 1990.

Original BMW Parts carry a 24-month parts warranty.

A failed cylinder head oil non-return valve is a common cause of oil pressure and lubrication problems in the cylinder head at startup. This number supersedes 11-12-1-726-597, and BMW rates the change as exchangeable retrospectively, so the current valve is the correct replacement for cars built with the earlier part. One valve number serves every engine family above, from the early M50 in the E34 and E36 through the M54 and M56 in the E46, E83, E53, and E85.

Technical Details

• Manufacturer: BMW (Original BMW part)
• Part number: 11-12-1-735-180
• BMW part name: non-return valve
• Position: cylinder head oil supply
• Weight: 18 g (0.63 oz)
• Made in Germany
• Sold as: one piece
• Production start: April 1990
• Supersedes: 11-12-1-726-597, exchangeable retrospectively
• Warranty: 24 months on Original BMW Parts

Common Questions

What problems can a bad valve cause?
A failed valve is a common cause of oil pressure and lubrication problems in the cylinder head at startup.

Does this replace part 11-12-1-726-597?
Yes. BMW superseded 11-12-1-726-597 with this number and rates the change as exchangeable retrospectively.

Is the same valve used on the M50 and the M54?
Yes. BMW applies this one number across the M50, M52, M54, M56, S50, and S52 applications shown above.

Fitment & Compatibility

Confirm your model year and submodel against the table below before ordering. Send your VIN and PMB Performance will confirm the fit, drawing on more than 20 years in the trade.