Is this BMW billet washer fluid cap a full replacement or a cover?

The MMX BMW billet washer fluid cap is a complete OE replacement machined from solid T-6061 billet aluminum — not a stick-on cover or clip-over sleeve. It replaces the factory plastic cap entirely, threading into the washer fluid reservoir using the same fitment as the OEM part, with a pre-sealed design for a precise, leak-free fit.

Which logo engraving options are available?

The MMX billet washer fluid cap is available with either the MMX or MMR logo engraved on the cap face. Select your preferred engraving at checkout. Both options are available in the same gloss black anodized finish.

Does this BMW billet washer fluid cap fit all F-chassis models?

Yes. The MMX billet washer fluid cap is compatible with all F-chassis BMW models including the 1, 2, 3, 4, 5, 6, and 7 Series, the M2, M3, M4, M5, and M6, and the X1 through X6 M. The washer fluid reservoir cap thread is shared across the full F-chassis range.

Will the anodized finish last in an engine bay environment?

Yes. The gloss black anodizing on the MMX billet cap is applied to the aluminum surface rather than painted on, making it resistant to heat, moisture, and the cleaning products commonly used in engine bay detailing. It will not peel, flake, or fade under normal engine bay conditions.

How does this compare to cheaper stick-on washer cap covers?

Stick-on covers clip or glue over the factory plastic cap and add bulk without improving function. The MMX BMW billet washer fluid cap replaces the factory cap completely with a solid machined unit — lower profile, better finish, and a tactile quality that stick-on covers cannot replicate.

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Description

MMX Billet Washer Fluid Cap for BMW F-Chassis Models

BMW billet washer fluid cap from MMX Performance replaces the factory plastic washer fluid reservoir cap across all F-chassis BMW models with a complete CNC-machined T-6061 billet aluminum unit not a stick-on cover, a full OE replacement. The OEM plastic cap is a visible weak point in an otherwise well-detailed engine bay; the MMX unit eliminates it with a precision-machined, solid aluminum cap sealed for a leak-free fit that threads into the reservoir using the same fitment as the factory part. Available with either MMX or MMR logo engraving and finished in a durable gloss black anodizing, it delivers a satisfying tactile upgrade that sits cleanly alongside other engine bay modifications without drawing attention for the wrong reasons. Designed and manufactured in the UK, compatible with the full F-chassis range from the 1 Series through to the X6 M.

Features

Full OE replacement; not a stick-on cover — CNC-machined from solid T-6061 billet aluminum
Gloss black anodized finish for long-term durability
Available with MMX or MMR engraved logo
Pre-sealed design for a precise, leak-free fit
Direct replacement for the OEM plastic cap; same thread fitment
Compatible with all F-chassis BMW washer fluid reservoirs
Designed and manufactured in the UK

Applications

BMW 1 Series: F20, F21 | 2012-2019
BMW 2 Series: F22, F23, F45, F46 | 2014-2021
BMW 3 Series: F30, F31, F34, F35 | 2012-2019
BMW 4 Series: F32, F33, F36 | 2013-2020
BMW 5 Series: F07, F10, F11 | 2011-2017
BMW 6 Series: F06, F12, F13 | 2011-2018
BMW 7 Series: F01, F02 | 2008-2015
BMW M2: F87 | 2016-2021
BMW M3: F80 | 2014-2018
BMW M4: F82, F83 | 2014-2020
BMW M5: F10 | 2011-2016
BMW M6: F06, F12, F13 | 2012-2018
BMW X1: F48, F49 | 2016-2022
BMW X2: F39 | 2018-2023
BMW X3: F25 | 2011-2017
BMW X4: F26 | 2014-2018
BMW X5: F15 | 2013-2018
BMW X5 M: F85, F95 | 2015-2018, 2020-present
BMW X6: F16 | 2015-2019
BMW X6 M: F86, F96 | 2015-present

Notes

Available with MMX or MMR logo engraving
Sold as a single cap

Frequently Asked Questions

Is this BMW billet washer fluid cap a full replacement or a cover? The MMX BMW billet washer fluid cap is a complete OE replacement machined from solid T-6061 billet aluminum — not a stick-on cover or clip-over sleeve. It replaces the factory plastic cap entirely, threading into the washer fluid reservoir using the same fitment as the OEM part, with a pre-sealed design for a precise, leak-free fit.
Which logo engraving options are available? The MMX billet washer fluid cap is available with either the MMX or MMR logo engraved on the cap face. Select your preferred engraving at checkout. Both options are available in the same gloss black anodized finish.
Does this BMW billet washer fluid cap fit all F-chassis models? Yes. The MMX billet washer fluid cap is compatible with all F-chassis BMW models including the 1, 2, 3, 4, 5, 6, and 7 Series, the M2, M3, M4, M5, and M6, and the X1 through X6 M. The washer fluid reservoir cap thread is shared across the full F-chassis range.
Will the anodized finish last in an engine bay environment? Yes. The gloss black anodizing on the MMX billet cap is applied to the aluminum surface rather than painted on, making it resistant to heat, moisture, and the cleaning products commonly used in engine bay detailing. It will not peel, flake, or fade under normal engine bay conditions.
How does this compare to cheaper stick-on washer cap covers? Stick-on covers clip or glue over the factory plastic cap and add bulk without improving function. The MMX BMW billet washer fluid cap replaces the factory cap completely with a solid machined unit lower profile, better finish, and a tactile quality that stick-on covers cannot replicate.

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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MMX Billet Washer Fluid Cap for BMW F-Chassis Models [MMR03-0000/MMR03-0001]

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MMX Billet Washer Fluid Cap for BMW F-Chassis Models

Features

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Notes

Frequently Asked Questions

About MMX Performance

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