MMX Magnetic Diff Oil Drain Plug / Sump Plug for BMW & MINI Final Drives, M22 x 1.5 Thread

Protect your final drive with this magnetised rear axle drain bolt. During every mile, tiny metal filings and swarf from gears and bearings circulate in the lubricant. This smart drain screw traps that ferrous debris before it can recirculate, helping to keep the oil cleaner for longer and supporting smoother, quieter running. It is a low cost, high impact upgrade for road cars, track builds and fast-road daily drivers alike.

Designed to replace the factory drain screw on housings that use an M22 x 1.5 thread, it is a straightforward swap during a diff oil change. If you are refreshing lubricant, setting up an LSD, or preparing for a track day, adding a magnetised sump plug is proven preventative maintenance that can extend component life.

• Captures ferrous particles and swarf to help reduce wear on crown wheel, pinion, spider gears and bearings
• Keeps differential fluid cleaner between services for more consistent protection
• Direct replacement drain bolt for casings with M22 x 1.5 thread size
• Ideal for open diffs and limited slip differentials across many BMW and MINI platforms
• Reusable at every oil change - simply wipe clean and refit
• Perfect addition to any drivetrain maintenance or performance upgrade plan

Fitment: suits differential housings that use an M22 x 1.5 drain port. Always confirm the thread on your specific axle casing before ordering. Many BMW and MINI final drives use this size.

Installation: a quick DIY job for competent home mechanics. Remove the original drain screw, allow fluid to drain, clean mating surfaces, then install the magnetised plug to the manufacturer’s torque specification. Use a fresh sealing washer where required and refill with the correct grade of gear oil.

Professional fitting available: want it supplied and fitted along with a diff fluid service or LSD setup? Book in with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote.

Why buy from us: we run this upgrade on our own builds and customer cars, and feedback has been excellent for reliability, cleanliness at service intervals and peace of mind. A simple change that delivers real-world protection for your rear axle.

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