On track, the factory differential pan in an F80 M3, F82 M4 or F87 M2 runs out of answers fast. There is not much oil in it, nothing to stop that oil sloshing away from the gears in long corners, and little surface to shed heat. The MMX Performance High-Capacity Baffled Differential Sump fixes all three in one bolt-on part.
Machined from 6061-T6 billet aluminum, it replaces the factory differential sump and adds up to 2 liters of oil capacity. An internal windage tray keeps oil where the gears and pinion need it under acceleration, braking and cornering, while internal and external fins add surface area to pull heat out lap after lap.
Why Upgrade to the MMX Baffled Differential Sump
More oil and more cooling surface mean lower, steadier differential temperatures during repeated high-load use. The windage tray reduces oil churn and drag, and an integrated -8AN port with an M22 to -8AN adapter gives you a ready connection point if you later add an external differential cooler.
Running a Drexler or other mechanical limited-slip differential? The extra-wide windage tray is designed to clear Drexler and other F8X mechanical LSDs without the internal trimming the factory sump needs. Pair it with the MMX F8X Dual Differential Mount and MMX front differential cradle (MMR55-1604) for a complete F8X differential mounting and cooling setup.
What's Included
- Billet CNC-machined baffled differential sump
- Billet CNC-machined windage tray
- Magnetic drain plug and seal
- Fill plug and seal
- M22 to -8AN adapter for an external oil cooler
- -8AN plug
- Installation hardware
Key Features
- Precision-machined 6061-T6 billet aluminum construction
- Adds up to 2 liters of differential oil capacity
- Internal windage tray maintains gear and pinion lubrication and reduces oil churn
- Internal and external cooling fins for improved oil cooling
- Integrated -8AN port for an external differential cooler
- Extra-wide windage tray clears Drexler and other F8X mechanical LSDs without trimming
- Direct replacement for factory differential oil pan 33 13 2 284 835
- Uses the factory mounting points, no permanent modification
- Part number: MMR55-1000
Vehicle Fitment
Fits the following N55- and S55-powered models:
- BMW F80 M3 Sedan (2015-2018)
- BMW F82 M4 Coupe (2015-2020)
- BMW F83 M4 Convertible (2015-2020)
- BMW F87 M2 (2016-2018)
- BMW F87 M2 Competition (2019-2021)
Installation Notes
Professional installation is recommended. MMX publishes these torque values:
- 2 x M6x1.0 Torx bolts: 8 Nm
- 16 x OEM M6x30 bolts (BMW 11 52 9 908 732): 12 Nm
- 2 x M22x1.5 drain and fill plugs: 45 Nm
- 1 x -8AN plug: 45 Nm
- Raise the car level and drain the differential oil.
- Remove the factory differential sump.
- Fit the windage tray and install the MMX sump on the factory mounting points, torquing all bolts to the values above.
- Install the drain plug, fill the differential with the correct oil and install the fill plug.
- Check for leaks before driving.
