Why do I need a new BMW oil drain plug washer at every oil change?

A crush washer seals by deforming under torque to fill the microscopic gaps between the drain plug and the sump pan. That deformation is permanent and one-time; reusing the same washer means it can no longer conform properly to seal a second time, which is one of the most common causes of a slow oil leak developing after a service. A fresh BMW oil drain plug washer at every oil change guarantees a correct seal.

Is this BMW oil drain plug washer a genuine OE part or aftermarket?

This is an MMX aftermarket replacement manufactured to OE specifications for dimensions and material. It is engineered as a direct, precise fit for the M12x1.5 oil-sump drain plug used across BMW and MINI, sealing correctly without modification.

Does this fit all BMW and MINI models?

The MMX BMW oil drain plug washer fits any BMW or MINI model that uses the M12x1.5 oil-sump drain plug thread, which spans the majority of BMW and MINI engines. Check your vehicle's drain plug thread size before ordering if you are unsure which size your model uses.

Why does the set include 5 washers instead of just 1?

A set of 5 covers multiple future oil changes, since a fresh washer is needed at every service. Buying a set rather than a single washer means the correct part is already on hand for the next several services, which is more convenient than ordering a single replacement each time.

Is the drain plug included with this set?

No. This set includes the crush washers only. The oil sump drain plug itself is not included and must be sourced separately if a replacement plug is also needed.

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Description

MMX Replacement M12 Oil-Plug Crush Washer Set for BMW and MINI Vehicles

BMW oil drain plug washer set from MMX Performance supplies five replacement crush washers engineered to OE specifications for BMW and MINI vehicles equipped with an M12x1.5 oil-sump drain plug. A crush washer is a single-use seal by design: the washer deforms slightly under torque to fill the microscopic imperfections between the drain plug and the sump pan, and that deformation cannot be relied upon to seal a second time correctly. Reusing a crush washer is one of the most common causes of a slow oil leak after a routine oil change, which makes a fresh washer at every service a simple, low-cost way to guarantee a leak-free seal. The MMX BMW oil drain plug washer is manufactured to OE-spec dimensions and material for a precise, direct-fit replacement that seats correctly against both the plug and the sump pan every time. Supplied as a set of five, the kit covers multiple services or sits in a service kit for ongoing preventative maintenance. The oil sump drain plug itself is not included.

Features

Direct-fit OE-spec replacement for M12x1.5 oil sump drain plugs
Crush-type sealing design for a precise, leak-free seal
OE-spec materials and dimensions
Straightforward installation at every oil change

Applications

BMW
MINI

Notes

Oil sump drain plug is not included
Sold as a set of 5 washers

Frequently Asked Questions

Why do I need a new BMW oil drain plug washer at every oil change? A crush washer seals by deforming under torque to fill the microscopic gaps between the drain plug and the sump pan. That deformation is permanent and one-time; reusing the same washer means it can no longer conform properly to seal a second time, which is one of the most common causes of a slow oil leak developing after a service. A fresh BMW oil drain plug washer at every oil change guarantees a correct seal.
Is this BMW oil drain plug washer a genuine OE part or aftermarket? This is an MMX aftermarket replacement manufactured to OE specifications for dimensions and material. It is engineered as a direct, precise fit for the M12x1.5 oil-sump drain plug used across BMW and MINI, sealing correctly without modification.
Does this fit all BMW and MINI models? The MMX BMW oil drain plug washer fits any BMW or MINI model that uses the M12x1.5 oil-sump drain plug thread, which spans the majority of BMW and MINI engines. Check your vehicle’s drain plug thread size before ordering if you are unsure which size your model uses.
Why does the set include 5 washers instead of just 1? A set of 5 covers multiple future oil changes, since a fresh washer is needed at every service. Buying a set rather than a single washer means the correct part is already on hand for the next several services, which is more convenient than ordering a single replacement each time.
Is the drain plug included with this set? No. This set includes the crush washers only. The oil sump drain plug itself is not included and must be sourced separately if a replacement plug is also needed.

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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