Why does the BMW differential drain plug O-ring need replacing at every service?

The BMW differential drain plug O-ring compresses under torque and takes a permanent set against the sealing surface over one service interval. Reusing the same O-ring risks an imperfect seal that allows differential fluid to seep past the drain plug thread. Replacing the O-ring at every differential fluid change eliminates that leak risk and takes only seconds during the service.

Is this BMW differential drain plug O-ring compatible with the OEM drain plug?

No. This O-ring is sized and profiled specifically for the MMX M22x1.5 Magnetic Differential Drain Plug. It is not compatible with the OEM BMW differential drain plug or other aftermarket drain plug brands. Only use this O-ring with the MMX unit.

How many services does a 5-pack of BMW differential drain plug O-rings cover?

One O-ring per service — the 5-pack covers five complete differential fluid change intervals. Keep a pack in stock so the correct BMW differential drain plug O-ring is always to hand at service time.

Is the MMX Magnetic Differential Drain Plug included?

No. This listing supplies replacement O-rings only. The drain plug shown in the product images is for reference and is not included. The MMX M22x1.5 Magnetic Differential Drain Plug is available separately.

How do I fit the replacement BMW differential drain plug O-ring?

Remove the old O-ring from the groove on the MMX drain plug, clean the groove, and seat the new BMW differential drain plug O-ring fully and evenly with no twisting. Reinstall the plug as normal. No additional tools are required beyond those used for the differential fluid change.

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Description

MMX Differential Drain Plug O-Ring 5-Pack for BMW Vehicles

BMW differential drain plug O-ring replacement pack from MMX Performance supplies five direct replacement sealing O-rings for the MMX M22x1.5 Magnetic Differential Drain Plug one O-ring per differential fluid service interval, covering five complete changes in a single purchase. The BMW differential drain plug O-ring should be replaced at every differential fluid change without exception. Each time the plug is tightened, the O-ring compresses and conforms to the sealing surface; over one service interval, it takes a permanent set in that position, and refitting a used O-ring creates a compromised seal that can allow differential fluid to seep past the plug thread. Fitting a fresh O-ring at each service is the same best practice applied to sump plug washers a straightforward step that eliminates leak risk. The O-ring seats in the groove on the MMX drain plug take seconds to install during a routine differential fluid change and require no additional tools. The differential drain plug itself is not included in this listing; this 5-pack is for existing MMX Magnetic Differential Drain Plug owners who need replacement seals for ongoing servicing.

Features

Direct replacement BMW differential drain plug O-ring for the MMX M22x1.5 Magnetic Differential Drain Plug
5-pack covers five differential fluid service intervals
Replace the BMW differential drain plug O-ring at every differential fluid change
Prevents fluid seepage from a compromised or reused seal
Straightforward installation during routine differential service; no additional tools required
OEM-style sealing profile for a precise, leak-free fit

Notes

For use with the MMX Magnetic Differential Drain Plug only. Not compatible with OEM or other aftermarket drain plugs.
Differential drain plug pictured for reference only; not included
Images are generic; actual product may vary
Sold as a 5-pack of O-rings

Frequently Asked Questions

Why does the BMW differential drain plug O-ring need replacing at every service? The BMW differential drain plug O-ring compresses under torque and takes a permanent set against the sealing surface over one service interval. Reusing the same O-ring risks an imperfect seal that allows differential fluid to seep past the drain plug thread. Replacing the O-ring at every differential fluid change eliminates that leak risk and takes only seconds during the service.
Is this BMW differential drain plug O-ring compatible with the OEM drain plug? No. This O-ring is sized and profiled specifically for the MMX M22x1.5 Magnetic Differential Drain Plug. It is not compatible with the OEM BMW differential drain plug or other aftermarket drain plug brands. Only use this O-ring with the MMX unit.
How many services does a 5-pack of BMW differential drain plug O-rings cover? One O-ring per service — the 5-pack covers five complete differential fluid change intervals. Keep a pack in stock so the correct BMW differential drain plug O-ring is always to hand at service time.
Is the MMX Magnetic Differential Drain Plug included? No. This listing supplies replacement O-rings only. The drain plug shown in the product images is for reference and is not included. The MMX M22x1.5 Magnetic Differential Drain Plug is available separately.
How do I fit the replacement BMW differential drain plug O-ring? Remove the old O-ring from the groove on the MMX drain plug, clean the groove, and seat the new BMW differential drain plug O-ring fully and evenly with no twisting. Reinstall the plug as normal. No additional tools are required beyond those used for the differential fluid change.

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 and puts 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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