MMX High Capacity Diff Sump | Diff Pan | G8x | M2 | M3 | M4

MMX High-Capacity Baffled Differential Sump / Diff Pan – BMW G87 M2, G80/G81 M3 & G82/G83 M4

Improve rear differential reliability and consistency on your BMW G8X M car with the MMX High-Capacity Baffled Differential Sump.

Designed specifically for the BMW G87 M2, G80/G81 M3 and G82/G83 M4 in both RWD and xDrive configurations, this uprated differential sump has been developed for demanding road and track use where the factory differential system can be subjected to prolonged high temperatures and sustained cornering loads.

With increased oil capacity, an integrated baffling system and a CNC-machined windage tray, the MMX sump is designed to help the differential maintain stable lubrication and consistent performance during hard driving.

For track-focused G8X owners, it also addresses the conditions that can contribute to the “Rear Axle Differential Lock: Driving Stability Limited” warning, helping reduce interruptions during demanding sessions.

Why Upgrade the G8X Differential Sump?

The rear differential on a BMW G8X M car is exposed to significant thermal and mechanical load.

During aggressive driving, the differential must manage:

• High torque output
• Sustained cornering forces
• Repeated acceleration
• High differential temperatures
• Rapid changes in vehicle direction
• Extended track sessions

As those demands increase, maintaining a consistent supply of differential oil becomes increasingly important.

The MMX High-Capacity Baffled Sump is designed to improve oil control and overall differential efficiency during these conditions.

Key Features

• MMX high-capacity differential sump
• Designed for BMW G8X M cars
• Compatible with RWD and xDrive
• Increased differential oil capacity
• Internal baffling system
• CNC-machined billet construction
• CNC-machined windage tray
• Designed for demanding road and track use
• Helps maintain consistent differential lubrication
• Designed to reduce the conditions associated with differential stability warnings
• Integrated external oil cooler provision
• Supplied with M22 to -8AN adaptor
• Magnetic drain plug included
• Fill plug and seals included
• Compatible with MMX Dual Differential Mount
• No additional mounting hardware required when combining with MMX Dual Differential Mount
• Dual Differential Mount sold separately

Designed for Track Use

The MMX High-Capacity Differential Sump has been developed specifically with hard-driven G8X M cars in mind.

Track driving places the differential under significantly greater load than normal road use.

Repeated high-speed cornering, braking and acceleration can increase:

• Differential temperature
• Oil movement inside the casing
• Lubrication demands
• Load on the active differential system

The MMX sump is designed to help the rear differential operate more consistently during these conditions.

Increased Oil Capacity

One of the main benefits of the MMX sump is its increased oil capacity.

A larger volume of differential oil can provide several performance advantages.

Greater fluid volume gives the system more thermal mass, meaning it can absorb more heat before reaching the same temperature as a smaller oil volume.

This can help with:

• Heat management
• Consistency during longer track sessions
• Differential lubrication
• Reduced thermal stress

For cars subjected to repeated hard use, additional oil capacity can be particularly valuable.

Internal Baffling

The MMX sump incorporates an internal baffling system designed to help control the movement of differential oil.

During aggressive cornering, braking and acceleration, fluid inside the differential is subjected to substantial forces.

Without adequate control, oil can move away from critical areas.

The baffled design helps keep lubricant more consistently positioned around the differential components during high-G driving.

This makes the sump particularly relevant for:

• Track-day cars
• Semi-slick tyre setups
• High-grip road tyres
• Lowered G8X builds
• Cars generating sustained lateral load

CNC-Machined Windage Tray

The MMX kit also includes a billet CNC-machined windage tray.

The windage tray helps manage the interaction between the rotating differential components and the oil inside the casing.

By helping control excess fluid movement around the rotating assembly, it contributes to a more stable internal oil environment.

This forms part of MMX’s broader approach to maintaining consistent lubrication and efficiency under high-load conditions.

Helps Prevent Rear Axle Differential Warnings

MMX specifically developed the sump to help prevent the:

“Rear Axle Differential Lock: Driving Stability Limited”

warning from appearing during demanding use.

For owners using their G8X M2, M3 or M4 on track, this can be an important benefit.

A differential warning during a session can interrupt driving and reduce confidence in the vehicle.

By improving fluid capacity, oil control and thermal management, the MMX sump is designed to help the differential operate more consistently under severe conditions.

Improved Differential Temperature Management

Differential temperature is particularly important on cars used for repeated high-performance driving.

As oil temperature rises, lubricant performance can change and the active differential system may become more thermally stressed.

The increased oil volume of the MMX sump helps provide greater thermal capacity.

The provision for an external oil cooler also gives owners the ability to take temperature management even further on heavily track-focused vehicles.

External Differential Oil Cooler Provision

The MMX sump includes an M22 to -8AN adaptor for connection to an external differential oil cooling system.

This allows the sump to form part of a more comprehensive cooling setup if required.

For vehicles used in:

• Long track sessions
• Motorsport
• High ambient temperatures
• High-power applications
• Endurance-style events

adding an external differential oil cooler can provide an additional level of thermal control.

The external cooler itself is not included unless otherwise stated.

Magnetic Drain Plug

A magnetic drain plug is supplied with the sump.

The magnetic element can help collect small ferrous particles circulating within the differential oil.

This provides an additional maintenance benefit and can make it easier to inspect the condition of the fluid during servicing.

The supplied drain plug also includes the required seal.

Fill Plug & Seal Included

The MMX package includes a dedicated fill plug and seal.

This allows the sump to be installed as a complete assembly without needing to reuse the original fill plug where not required.

CNC-Machined Billet Construction

The MMX sump is manufactured using billet CNC machining.

This provides:

• High dimensional accuracy
• Strong construction
• Consistent fitment
• High-quality finish
• Durability under demanding use

The billet construction also allows MMX to integrate the internal baffling, mounting points and external cooler provisions into one complete assembly.

Compatible with MMX Dual Differential Mount

The High-Capacity Differential Sump has been designed to integrate directly with the MMX Dual Differential Mount.

This means owners can combine the two systems without requiring additional mounting hardware between them.

The Dual Differential Mount adds a second point of support to the rear differential, while the High-Capacity Sump focuses on fluid control, temperature management and differential reliability.

Together, they provide a more comprehensive rear drivetrain upgrade.

No Additional Hardware Required for the Dual Mount

When fitting the MMX Dual Differential Mount to the High-Capacity Sump, no additional attachment hardware is required beyond the components supplied with the respective products.

This simplifies installation and ensures the two systems are designed to work together correctly.

Please note that the MMX Dual Differential Mount is sold separately.

Ideal Combination for Track Builds

For track-focused G8X builds, combining the sump with the MMX Dual Differential Mount provides benefits in two key areas.

The sump improves:

• Oil capacity
• Lubrication control
• Heat management
• Differential consistency

The dual mount improves:

• Differential stability
• Drivetrain response
• Resistance to movement under torque

Together, these upgrades provide a strong foundation for cars subjected to repeated high-load driving.

Suitable for RWD & xDrive

The MMX High-Capacity Differential Sump is designed to fit both rear-wheel-drive and xDrive G8X M cars.

This includes:

• RWD G87 M2
• RWD G80/G82 models
• xDrive G80/G81/G82/G83 models
• Applicable later G87 configurations

This broad compatibility makes it suitable across the majority of the G8X M platform.

Ideal for High-Power Cars

Although the sump is especially valuable for track use, it can also be beneficial on tuned road cars.

Increased engine output places greater torque through the differential.

This can increase heat generation and loading within the drivetrain.

The MMX sump is therefore particularly relevant for cars fitted with:

• MMX Power Control Module
• ECU tuning
• Higher boost
• Performance exhaust upgrades
• Intake upgrades
• High-grip tyres
• Track-focused suspension

Track-Day Reliability Upgrade

For frequent track users, the MMX sump should be considered a reliability-focused supporting modification rather than simply a performance accessory.

The objective is to help the differential continue operating consistently as temperatures and loads rise throughout a session.

This makes it particularly suited to:

• Track-day vehicles
• Clubsport builds
• Time Attack cars
• Fast-road cars
• High-power G8X builds
• Cars on semi-slick tyres

Road Use Benefits

The sump is not limited to track vehicles.

Cars driven hard on the road can also benefit from:

• Increased oil capacity
• Improved oil control
• Better thermal reserve
• Magnetic drain plug
• External cooler compatibility

For owners building a high-quality fast-road G8X, the sump provides additional drivetrain headroom even if the car only sees occasional circuit use.

BMW G87 M2

The MMX High-Capacity Differential Sump is compatible with the BMW G87 M2.

The G87’s powerful S58 engine places substantial load through the rear differential, making improved oil management especially useful on tuned or track-driven examples.

BMW G80 / G81 M3

The sump is suitable for the BMW G80 M3 and G81 M3 Touring.

Both RWD and xDrive applications are supported where applicable.

For track-focused M3 builds, the additional capacity and baffling can help improve consistency across longer sessions.

BMW G82 / G83 M4

The BMW G82 M4 Coupe and G83 M4 Convertible are also supported.

For high-power or frequently tracked M4s, the sump provides additional differential cooling and lubrication headroom.

Compatibility

Designed for BMW G8X M cars including:

• BMW G87 M2
• BMW G80 M3
• BMW G81 M3 Touring
• BMW G82 M4
• BMW G83 M4 Convertible
• RWD models
• xDrive models

Please confirm exact vehicle specification before ordering.

What's Included?

The MMX High-Capacity Baffled Differential Sump includes:

• Billet CNC-machined baffled differential sump
• Billet CNC-machined windage tray
• Magnetic drain plug and seal
• Fill plug and seal
• M22 to -8AN adaptor for external oil cooler connection
• Necessary installation hardware

MMX Dual Differential Mount sold separately.

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