Original BMW Oil Constant Pressure Valve for BMW M3, Z3 M, and Z4 M (2001–2008)

On S54-powered BMW M cars, the Original BMW 11-11-1-318-185 constant pressure valve is the 1-bar oil pressure valve on the right side of the engine block, fitted to the E46 M3, Z3 M Coupe and M Roadster, and Z4 M Coupe and M Roadster. BMW rates it at 1 bar and supplies it as a single piece weighing 17 grams, and it comes with its O-ring. This valve is a common point for engine oil leaks on higher-mileage engines. Because of where it sits, oil escaping from it can run down and look like a rear main seal leak. BMW has produced this number since August 1992, and it is made in Slovakia.

This Original BMW Part carries a 24-month parts warranty.

Engine oil valves of this type hold a set pressure in their circuit, opening and closing to keep it steady. On these cars the same valve serves the S54 across three model lines, including the E46 M3 CSL, so there is no version split between an M3 and a Z4 M. Since the valve ships with its O-ring, the seal is already part of the purchase. Keeping the mileage-related leak point in mind can save an owner from chasing the wrong seal on an S54.

Technical Details

• Manufacturer: BMW
• Part number: 11-11-1-318-185
• BMW part name: constant pressure valve
• Pressure rating: 1 bar
• Weight: 17 g (0.6 oz)
• Includes: O-ring
• Location: right side of the engine block
• Production start: August 1992
• Country of manufacture: Slovakia
• Warranty: 24 months on Original BMW Parts

Common Questions

Does it come with a new O-ring?
Yes, the O-ring is included.

My S54 looks like it has a rear main seal leak. Could it be this valve?
It can. This valve is a common leak point on higher-mileage engines, and the leak may appear as a rear main seal leak.

PMB supplies the genuine BMW oil system parts S54 owners rely on.

Fitment & Compatibility

Use the table below to verify the year and submodel for your build. With over 20 years of parts and fitment experience, PMB Performance can match this to your VIN.