Billet 6061-T6 baffled differential sump for the G87 M2, G80 / G81 M3, and G82 / G83 M4. Up to 2 liters more capacity, integrated windage tray, cooling fins, and -8AN cooler port. Prevents track-day diff overheat warnings.

BMW RTV sealant required for installation (optional add-on at order)

MMX High-Capacity Baffled Differential Sump for G8X BMW M2 / M3 / M4

The MMX G8X M2 M3 M4 Differential Sump keeps the rear differential alive through the abuse the OEM pan was never designed for. CNC-machined from 6061-T6 billet aluminium as a direct OE-fit replacement, it adds up to 2 liters (2.10 quarts) of capacity, integrates an internal baffled windage tray, and sheds heat through internal and external cooling fins. For circuit-driven G8X cars it prevents the “Rear Axle Differential Lock: Driving Stability Limited” warning that cuts track sessions short when OEM diff temperatures climb.

Features

• Up to 2 liters (2.10 quarts) more oil capacity than the OEM pan
• Integrated baffled windage tray maintains constant lubrication through high-G maneuvers while reducing component drag
• Internal and external cooling fins maximize heat dissipation surface area
• -8AN port with included M22 to -8AN adaptor for plumbing an external diff cooler
• Prevents the OEM diff overheat warning that limits track sessions
• Direct OE-style fitment with no modifications, RWD and xDrive compatible
• Integrates cleanly with the MMX Dual Differential Mount with no extra hardware
• 1-year manufacturer warranty against defects in materials and workmanship

G8X M2 M3 M4 Differential Sump Specifications

• Material: CNC-machined 6061-T6 billet aluminium
• Added capacity: Up to 2 liters (2.10 quarts) over OEM
• Cooler port: -8AN (M22 to -8AN adaptor included)
• Included: Billet baffled sump, billet windage tray, magnetic drain plug + seal, fill plug + seal, M22 to -8AN adaptor, mounting hardware
• Sealant option: Available with BMW RTV sealant (83190404517), choose at order

Applications

• BMW M2: G87 | 2023 to present
• BMW M3: G80, G81 | 2021 to present
• BMW M4: G82, G83 | 2021 to present

Notes

• X3M / X4M (S58-engined SUVs) fitment is not explicitly confirmed. Contact us before ordering for those chassis.
• Professional installation recommended. BMW RTV sealant is required to seal the sump, select the option with sealant if you do not already have it.
• Pairs with the MMX Dual Differential Mount (MMR55-1606), or get the complete package in the Ultimate Differential Track Pack (MMR55-1600KT).

Frequently Asked Questions

What problem does this solve on track?

Sustained high-load driving overheats the OEM differential, triggering the “Driving Stability Limited” warning and cutting power to protect the diff. The G8X M2 M3 M4 Differential Sump adds capacity, baffling, and cooling surface to keep temperatures consistent lap after lap.

Does it fit xDrive cars?

Yes, both RWD and xDrive G8X drivetrains are supported.

Can I plumb in an external cooler?

Yes, an additional -8AN port with an included M22 adaptor lets you connect an external diff cooler when you need even more cooling capability.

Do I need sealant to install it?

Yes, BMW RTV sealant (83190404517) is required. Select the “with sealant” option at order if you do not already have it.

Does it work with the MMX Dual Differential Mount?

Yes, the sump is designed to integrate with the mount with no additional hardware.

Is the windage tray included?

Yes, a billet CNC-machined windage tray ships with every sump.

About MMX Performance

MMX Performance is a UK-based specialist in performance parts for BMW and MINI vehicles, crafting high-quality upgrades that blend precision engineering, rigorous testing, and motorsport heritage. Driven by enthusiast culture, MMX designs its products in the UK, often putting them through track validation, to ensure durability, fitment accuracy, and on-road performance. Their catalog spans drivetrain components, spacers, hardware, and chassis enhancements, all tailored to elevate both the driving experience and visual appeal of BMW and MINI models.