Does the BMW G8x differential sump fit xDrive models?

Yes. The BMW G8x differential sump is compatible with both RWD and xDrive G8x drivetrains — M3 Competition xDrive, M4 Competition xDrive, and standard G87 M2 included.

Can I plumb in an external cooler with this BMW G8x differential sump?

Yes. The sump includes a -8AN port and an M22 to -8AN adaptor that allows an external differential cooler to be connected directly, for builds requiring the maximum available cooling capability beyond what the integrated fins alone provide.

Does the BMW G8x differential sump require sealant?

Yes. BMW RTV sealant (part 83190404517) is required to seal the sump during installation. A sealant option is available at order for buyers who do not already have it; professional installation is recommended.

Does this work with the MMX Dual Differential Mount?

Yes. The BMW G8x differential sump is designed to integrate directly with the MMX Dual Differential Mount (MMR55-1606) with no additional hardware required. Both components are also available together as part of the Ultimate Differential Track Pack (MMR55-1600KT).

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Description

MMX High-Capacity Baffled Differential Sump for G8x BMW M2, M3, and M4

BMW G8x differential sump from MMX Performance keeps the rear differential alive through the sustained abuse the OEM pan was never designed to cover the G87 M2, G80/G81 M3, and G82/G83 M4. The problem on track is well documented: sustained high-load driving overheats the OEM differential, triggering the “Rear Axle Differential Lock: Driving Stability Limited” warning that cuts power to protect the diff and ends the session. The MMX BMW G8x differential sump addresses this directly with three simultaneous improvements: up to 2 liters (2.10 quarts) of additional oil capacity over the OEM pan to buffer against thermal saturation; an integrated baffled windage tray that maintains constant lubrication through high-G cornering and braking while reducing component drag; and internal and external cooling fins that maximize heat dissipation surface area to shed heat faster. For builds requiring even more cooling capability, a -8AN port with an included M22 to -8AN adaptor allows an external diff cooler to be plumbed directly. CNC-machined from 6061-T6 billet aluminum as a direct OE-fit replacement compatible with both RWD and xDrive G8x drivetrains with no modification required. BMW RTV sealant is required to install; select the sealant option at order if not already on hand. Pairs with the MMX Dual Differential Mount with no additional hardware and is also available as part of the Ultimate Differential Track Pack.

Features

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

Applications

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

Notes

X3 M / X4 M (S58-engined SUVs) fitment is not explicitly confirmed. Contact us before ordering for those chassis.
Professional installation recommended. BMW RTV sealant is required; select the sealant option at order 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 the BMW G8x differential sump solve on track? The OEM differential on the G8x M2, M3, and M4 overheats under sustained high-load driving, triggering the “Rear Axle Differential Lock: Driving Stability Limited” warning that cuts power to protect the diff and ends the session. The BMW G8x differential sump adds 2 liters of oil capacity, an internal baffled windage tray, and internal and external cooling fins to keep temperatures consistent lap after lap.
Does the BMW G8x differential sump fit xDrive models? Yes. The BMW G8x differential sump is compatible with both RWD and xDrive G8x drivetrains M3 Competition xDrive, M4 Competition xDrive, and standard G87 M2 included.
Can I plumb in an external cooler with this BMW G8x differential sump? Yes. The sump includes a -8AN port and an M22 to -8AN adaptor that allows an external differential cooler to be connected directly, for builds requiring the maximum available cooling capability beyond what the integrated fins alone provide.
Does the BMW G8x differential sump require sealant? Yes. BMW RTV sealant (part 83190404517) is required to seal the sump during installation. A sealant option is available at order for buyers who do not already have it; professional installation is recommended.
Does this work with the MMX Dual Differential Mount? Yes. The BMW G8x differential sump is designed to integrate directly with the MMX Dual Differential Mount (MMR55-1606) with no additional hardware required. Both components are also available together as part of the Ultimate Differential Track Pack (MMR55-1600KT).

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.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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MMX High-Capacity Baffled Differential Sump for G8X BMW M2 / M3 / M4 [MMR55-1600-RTV/MMR55-1600]

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MMX High-Capacity Baffled Differential Sump for G8x BMW M2, M3, and M4

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