Upgraded M50 M54 Oil Pump and Tensioner

Upgraded S52/M50/M52 Oil Pump & Tensioner

Available per piece, or as an entire kit.

The PRD oil pump & tensioner kit is the only true solution on the market for the the S52, M50 and M52 oil pump failure epidemic. Contrary to popular belief, the true reason it is so common for these engines to end up either spinning the oil pump nut off the pump shaft or breaking the shaft is not engine harmonics. It is chain slack whipping back and forth at high rpm's, abusing the oil pump, sprockets and shaft. BMW did not use a tensioner, as they did in their race kit, to save costs over the course of millions of production engine builds. The common solution is a oil pump shaft upgrade, which we offer, however, to fully bulletproof your engine and fight against oil pump failure, chipped sprockets and chain wear, add the chain tensioner. On top of all this special ridged washers are used to stop the bolts from ever backing out.

The PRD chain tensionser is the only product of it's kind, and uses a polymer tensioner against the chain, stopping the chain slack from damaging the oiling system during high rpm's. The tensioner is a tested a piece which is produced and used on other OEM vehicles, and repurposed to be used in this application.

The reconditioned oil pump comes with an upgraded pump shaft, similar to the M54 GSR upgraded pump, that uses 4 bolts to attach to a custom drilled sprocket. It also features a beefed up shaft design, along with using a stronger material to take all the abuse you can dish out.

Every base is covered in this kit, so your investment is finally safe! No core needed, so no core charges either!

When both items are selected, the complete kit includes:
Reconditioned oil pump with upgraded shaft (4-bolt design)
Drilled oil pump sprocket
Oil pump chain tensioner
Template to drill and tap tensioner mounting hole

  • Terms and Conditions

    Due to the intended use of high performance products, Seems Legit Garage, LLC. ("SLG”) products and each part thereof, are sold "AS IS” and with all faults. To the fullest extent allowed by law, SLG Racing Products makes NO written, oral, expressed, or implied statement of warranty or guarantee on any product or part sold. SLG will not be liable for any direct, indirect, incidental, consequential, or special damages, including but not limited to, damage, injury, loss of life, loss of property or equipment, loss of profits or revenue, or claims from any individual or entity arising from the use of any SLG product. 

    RACING IS A DANGEROUS ACTIVITY AND PURCHASERS OF SLG PRODUCTS ACKNOWLEDGE THE INHERENT RISKS ASSOCIATED. SLG MAKES NO REPRESENTATIONS THAT ITS PRODUCTS CAN REDUCE OR ELIMINATE ANY SUCH RISK. SLG products are NOT FOR STREET, HIGHWAY, OR AIRCRAFT USE and are intended ONLY for race vehicles operated on closed-course facilities or race tracks with appropriate supervision of qualified technicians or mechanics to ensure that the safety needs of the race driver and others are met. SLG products could be combined with other products or parts which may not be suitable and could adversely affect performance of other race parts or the vehicle. The user shall determine the ultimate suitability and safety of the product for its intended use, and the user assumes all responsibility and risk in connection therewith.