Upgrade your G8X M2, M3, or M4 (RWD or xDrive) with a precision-engineered differential solution built for track enthusiasts who demand reliability, efficiency, and consistent performance. The MMX High-Capacity Baffled Differential Sump is designed to keep your drivetrain running cooler, better lubricated, and more stable under aggressive driving conditions by increasing fluid capacity, improving oil control, and enhancing heat dissipation.

This upgraded sump increases differential oil capacity by up to 2 litres (2.10 quarts), helping maintain consistent lubrication during extended high-G cornering and long track sessions. An integrated billet windage tray keeps the gears and pinion continuously supplied with oil while reducing internal drag, improving drivetrain efficiency and supporting long-term component life.

To stabilize differential temperatures, both internal and external cooling fins increase surface area for heat dissipation, providing more consistent thermal control on track or road. For higher-demand builds, the sump also supports external cooling integration through an additional -8AN port, and includes an M22 to -8AN adaptor for straightforward plumbing.

Each sump is CNC-machined from 6061-T6 billet aluminum for strength, precision, and OE-level fitment. It installs as a direct OE-style replacement with no modifications required and is compatible with the MMX Dual Differential Mount (MMR55-1606) with no additional hardware.

Product Details

• High-capacity baffled differential sump for improved lubrication stability
• Increases differential oil capacity by up to 2 litres (2.10 quarts)
• Integrated billet windage tray for constant lubrication and reduced drag
• Internal and external cooling fins for increased heat dissipation
• CNC-machined 6061-T6 billet aluminum construction
• OE-style drop-in fitment, no modifications required
• Includes additional -8AN port for external cooling integration
• Compatible with MMX Dual Differential Mount (MMR55-1606)
• Helps reduce the likelihood of “Rear Axle Differential Lock: Driving Stability Limited” warnings during track use

Vehicle Applications

• BMW G87 M2
• BMW G80 / G81 M3
• BMW G82 / G83 M4
• BMW F97 X3M / F98 X4M
• BMW F90 M5
• BMW F9X M8
• Compatible with both RWD and xDrive

What’s Included

• Billet CNC-machined high-capacity baffled sump
• Billet CNC-machined windage tray
• Magnetic drain plug and seal
• Fill plug and seal
• M22 to -8AN adaptor for external oil cooler integration
• Installation hardware

Key Features

• Increased oil capacity for consistent lubrication under high-G load
• Improved drivetrain efficiency and component longevity
• Enhanced temperature control through increased cooling fin surface area
• External cooling ready via -8AN port and included adaptor
• Precision-machined for OEM-style sealing and fitment
• Ideal for high-performance street use and track driving

Torque Specs

• Extension: 45 Nm
• Drain plug: 45 Nm
• Fill plug: 45 Nm
• -8AN plug fitting: 40 Nm
• Windage tray: 6–8 Nm (use high-temp threadlocker)
• Cover bolts: 12 Nm

Notes

• Professional installation recommended
• External cooler integration is intended for higher-demand builds and track use