Champion Rainbow Co. Ltd (Previously Golden Bloom)
MMX Rear Differential Cover High Capacity Final Drive Oil Pan / Diff Sump for BMW G8X M2 M3 M4 (RWD & xDrive)
MMX Rear Differential Cover High Capacity Final Drive Oil Pan / Diff Sump for BMW G8X M2 M3 M4 (RWD & xDrive)
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Push your BMW G-series M car harder for longer with this enlarged rear final-drive oil pan upgrade. Engineered for track days and fast-road use, the precision CNC billet aluminium housing and internal control system keep diff fluid where it should be during heavy cornering, braking and acceleration. On our own builds and across customer cars, this upgrade has consistently stopped the “Rear Axle Differential Lock: Driving Stability Limited” warning from interrupting sessions, delivering dependable performance lap after lap.
Why enthusiasts choose this rear differential cover
- Increased oil volume for improved thermal stability and consistent lubrication under hard driving
- Baffled internals and a dedicated windage tray to reduce surge, foaming and starvation
- Magnetic drain plug to capture metallic particles and protect the final drive
- Fill plug supplied for hassle-free servicing and gear oil changes
- External cooler ready via M22 to -8AN adaptor for advanced cooling setups
- Precision CNC-machined billet components for strength, sealing and reliability
- Fits both rear wheel drive and xDrive variants on the G8X platform
- Seamlessly integrates with the Dual Differential Mount with no extra hardware required (Dual Mount sold separately)
Fitment
Compatible with BMW M2, M3 and M4 on the G8X platform, in both RWD and xDrive configurations.
Installation and support
For professional fitting, fluid service and setup, we recommend booking with MJ Modifications in Warwickshire. Request a fitting quote: info@mjmodifications.co.uk.
What you receive
- Billet CNC-machined baffled rear diff housing
- Billet CNC-machined windage tray
- Magnetic drain plug with seal
- Fill plug with seal
- M22 to -8AN adaptor for an auxiliary oil cooler
- All required hardware
Built for confidence on road and circuit
Whether you are chasing PBs at the circuit, enjoying spirited B-road drives or need dependable cooling and lubrication for tuned power levels, this rear axle oil pan upgrade delivers. Our customers report noticeably steadier diff temperatures, cleaner servicing thanks to the magnetic plug, and rock-solid stability during extended stints.
Keywords: BMW rear differential cover upgrade, G8X rear axle oil pan, BMW M performance diff cooling, final drive sump for track day, M-car diff oil pan, xDrive rear diff upgrade, RWD differential housing, CNC billet aluminium diff cover, external cooler ready -8AN, motorsport rear final drive solution.
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