BMW M50 M52 Oil Pump Uprated
| Brand: | ZEDPERFORMANCE® |
| Product Code: | m50-m52-oil-pump |
| SKU : | ZE000328 |
| Availability: | 2-3 Days |
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£289.99 VAT incl.
Available Options
Available from December 2026. Resellers are welcome.
The engine oil pumps for BMW M50, M50TU and M52 are no longer available from BMW. You will quickly realise that when you plan to rebuild your engine but find no OE or aftermarket availability. Several versions of this oil pump circulate online but most of those are used oil pumps with significant wear as they are 30+ years old. E36 enthusiasts have very limited options to resurrect an old oil pump. The gerotor set is still available from BMW but not the oil pump assembly itself. The bad news is that what usually causes the loss of oil pressure or low oil pressure in these pumps is not the still available rotor set.
Causes of low oil pressure:
* The pressure relief valve has significant wear. This can be on both the piston itself and the relief piston aluminium bore. (Partially serviceable as the piston is still available from BMW.)
* The gerotor aluminium bore has scratches. This is usually caused by a lack of oil changes. Debris sucked up from the sump can get stuck between the rotors and their housing. This can permanently damage the aluminium housing.
In both cases above what causes the main problem is that the main aluminium housing cannot be changed or serviced. Changing the rotor set and the pressure relief piston will not always solve the problem of the worn, damaged aluminium bores.
Known issues with the M50, M52 oil pumps:
* The weak oil pump drive shaft is a well documented problem. The spline shaft can wear out in the shaft causing an immediate loss of oil pressure. Performance upgrades are available online. You can buy an upgraded shaft for a hefty price.
* Compatibility issues. BMW changed the oil pumps' design and mounting between 1990 and 1998. They also changed the gerotor thickness (flow rate) in those 8 years of production. The low flow oil pumps have been fitted on M50 and M50TU engines with the thinnest gerotor sets. Later in 1994 they introduced the M52 (non-vanos) engines with a thicker gerotor set.
The M52 engines with a thicker gerotor set had 2 versions.
* Cast iron M52 blocks: Oil pump with a thicker gerotor set, larger oil galleries, metal parts
* Aluminium M52 blocks: Oil pump with a thicker gerotor set, smaller oil galleries, plastic parts (mounting position is different from that on a cast iron block)
If you want to fit an oil pump off an aluminium M52 block to a cast iron M52 block then you will likely need to reslot the oil pump mounting in order to fit it.
Please keep in mind that our pump will not fit the M52TU engines!
Here at Zedperformance.co.uk we develop parts for the aftermarket. We decided to design and manufacture an improved version of these M50 & M52 oil pumps that resolves all problems with all circulating versions of these pumps.
What our upgraded oil pump design covers:
* Improved metal pressure relief valve piston. (A longer piston head is less prone to wear.)
* Fits ALL M50, M50TU and M52 engines. (No need to reslot the mounting hole.)
* Thicker gerotor set compared to the OE rotor sets resulting in an increased flow rate.
* Thicker shaft design to support high rev engines along with reducing the shaft's weight. (Shaft diameter has been increased from 15mm to 16mm.)
* Inferior spline sprocket to shaft design has been changed to a double D fitment using a left hand bolt with securing wires.
* Lightweight sprocket compared to the stock sprocket.
Compatibility:
* M50
* M50TU
* M52
| Engine and block | Models and relevant production years | Oil-pump configuration and OE references |
|---|---|---|
|
M50 non-VANOS Cast-iron block |
E34 520i / 525i saloon: 1990–1992. E34 520i / 525i Touring: 1991–1992. E34 525iX: saloon 1991–1992; Touring 1992. E36 320i / 325i saloon: 1990–1992. E36 320i / 325i coupé, including US 325is: early coupé production, approximately 1991/92–1992. |
Thin gerotor family; metal-type pressure-relief parts. Inner rotor: 11411722905. Outer rotor: 11411722907. Relief valve: 11411719937. Closing bush: 11411722836. These references describe the original pump configuration. A later replacement pump can have different internals. |
|
M50TU single VANOS Cast-iron block |
E36 320i / 325i saloon and coupé, including US 325is: 09/1992–1994/95, depending on version. E36 320i / 325i convertible: approximately 1993–1995. E34 520i / 525i saloon: 09/1992–1995/early 1996. E34 520i / 525i Touring: 09/1992–06/1996. E34 525iX: 09/1992–1995 saloon; Touring through 1996. |
Both thin and thick gerotor families; metal-type pressure-relief parts.
Catalogue rotor changeovers: 11411722905 / 11411722907. Later inner / outer rotors: 11411748098 / 11411748100. Relief valve: 11411719937. Closing bush: 11411722836. |
|
M52 single VANOS Cast-iron block |
North American E36 328i saloon: approximately 1995–1998 builds. North American E36 328is coupé / 328i convertible: approximately 1995–1999 builds. North American E36 323is coupé / 323i convertible: 1997–1999 builds. North American E39 528i saloon: approximately 1996–08/1998 builds. Special cast-iron engine variants also appear in BMW’s catalogue for other markets. These require individual engine identification. |
Thick gerotor family; metal-type pressure-relief parts. Inner rotor: 11411748098. Outer rotor: 11411748100. Relief valve: 11411719937. Closing bush: 11411722836.
Complete pump references include: |
|
M52 single VANOS Aluminium block |
European E36 320i: saloon/coupé 1994/95–1998; convertible 1994/95–1999; Touring 1995–1999. European E36 323i / 328i: saloon approximately 1995–1998; coupé, convertible and Touring approximately 1995–1999. E36 323ti Compact: 1997–2000. European E39 520i / 523i / 528i: saloon 1995–08/1998; Touring 1997–08/1998. E38 728i / 728iL: 1995–08/1998. Z3 2.8 roadster, including North America: 1996/97–1998, single-VANOS version. Early European Z3 2.8 coupé: 1998, before the M52TU changeover. |
Thick gerotor family; plastic-type pressure-relief parts. Inner rotor: 11411748098. Outer rotor: 11411748100. Relief valve: 11411703948. Closing bush: 11411703950. The rotor pair is the same as the cast-iron M52 branch; the relief valve and closing bush differ. Complete pump references include:E36: 11411748153. E39: 11411748146. E38: 11411740852. |
|
S50B30 European specification Cast-iron block Single VANOS |
E36 M3 3.0 coupé: 1992–1995. E36 M3 3.0 saloon: 1994–1995. E36 M3 3.0 convertible: 1994–1995. Includes the small Canadian European-specification allocation. Excludes the genuine M3 GT pump arrangement. |
Thin gerotor family; metal-type pressure-relief parts. Inner rotor: 11411722905. Outer rotor: 11411722907. Relief valve: 11411719937. Closing bush: 11411722836. RealOEM also displays replacement complete pump 11411740154. This replacement reference does not establish which rotor pair was originally fitted. RealOEM: European S50B30 oil pump |
|
S50B30US Cast-iron block Single VANOS |
US E36 M3 3.0 coupé: 1994–1995 production, generally sold as the 1995 model year. US M3 Lightweight: 1995. |
Thick gerotor family; metal-type pressure-relief parts. Complete pump: 11411740154. Inner rotor: 11411748098. Outer rotor: 11411748100. Relief valve: 11411719937. Closing bush: 11411722836. The checked US catalogue lists a different rotor pair from the European S50B30. RealOEM: S50B30US oil pump |
|
S52B32 Cast-iron block Single VANOS |
North American E36 M3 coupé: 1996–1999. North American E36 M3 saloon: 1996–1998 production, generally 1997–1998 model years. US E36 M3 convertible: 1998–1999. North American Z3 M Roadster: 1998–2000. North American Z3 M Coupé: 1998–2000. |
Thick gerotor family; metal-type pressure-relief parts. Complete pump: 11411740154. Inner rotor: 11411748098. Outer rotor: 11411748100. Relief valve: 11411719937. Closing bush: 11411722836. The S52-powered Z3 M has a cast-iron block, unlike the ordinary aluminium-block M52 Z3 2.8. RealOEM: E36 M3 S52 | Z3 M S52 |
* Classification note: “Thin/thick gerotor” and “metal/plastic” identify the reported physical designs. Metal/plastic refers to the pressure-relief piston and closing bush, not the entire oil pump.
Gerotor evolution in BMW M50, M50TU and M52 engines:
