Why does the OEM B58 oil filter housing cap need replacing?

The factory plastic oil filter housing cap on the B58 becomes brittle over years of heat cycling and the repeated torque applied at every oil service, eventually leading to cracking and oil leaks. The BMW B58 oil filter housing cap from MMX replaces it with billet aluminum, which does not degrade the same way, removing that failure point permanently.

Do I need a new O-ring to install this BMW B58 oil filter housing cap?

No. The cap is engineered for direct compatibility with the OEM O-ring, so the existing factory O-ring is reused during installation. There is no need to purchase a separate seal.

Is the oil filter included with this BMW B58 oil filter housing cap?

No. This listing is for the housing cap only; the filter is not included. MMX also offers a stainless steel lifetime oil filter for B58 engines, as well as a complete oil filter kit that bundles the housing cap, filter, and magnetic sump plug together.

Will the anodized finish discolor under engine bay heat?

Prolonged exposure to excessive heat can affect the appearance of any anodized aluminum finish, which is an inherent characteristic of the anodizing process rather than a product defect. This does not affect the cap's function or sealing performance, only its cosmetic appearance over extended periods.

How long does installation take?

The BMW B58 oil filter housing cap is a direct, bolt-on replacement for the factory cap with no special tools required beyond those already used during a routine oil service. Most owners fit it in a few minutes as part of an existing oil change.

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Description

MMX Billet Oil Filter Housing Cap for BMW Vehicles with B58 Engine

BMW B58 oil filter housing cap from MMX Performance is a high-strength, CNC-machined billet aluminum replacement for the stock plastic cap on B58-powered BMW models, addressing the factory part’s well-known tendency to crack and develop leaks over time. Crafted from 6061 billet aerospace-grade aluminum and finished in MMX’s signature gloss black anodizing, the BMW B58 oil filter housing cap pairs enhanced durability with a refined, motorsport-inspired appearance under the hood. Engineered for direct compatibility with the OEM O-ring and filter housing, it reuses the factory O-ring, so no separate seal purchase is required, ensuring a secure fit and hassle-free installation. It is an ideal addition during routine oil service, replacing a known weak point with a part that will not degrade the same way over years of heat cycling and service torque. The filter itself is not included; this is the housing cap only.

Features

CNC-machined from 6061 billet aerospace-grade aluminum
Anodized in MMX signature gloss black finish
Reuses factory O-ring; no separate seal needed
Direct compatibility with the OEM O-ring and filter housing
Full OE cap replacement
Designed in the UK
Joins MMX’s existing range of billet caps

Applications

BMW 340i: F30, F31, F34 | 2016-2019
BMW 440i: F32, F33, F36 | 2016-2020
BMW 540i: G30, G31, G60, G61 | 2017-present
BMW 640i: G32 | 2017-2023
BMW 740i: G11, G12, G70 | 2016-present
BMW 840i: G14, G15, G16 | 2019-present
BMW M140i: F20, F21 | 2016-2019
BMW M240i: F22, F23, G42 | 2016-present
BMW M340i: G20, G21 | 2019-present
BMW M440i: G22, G23, G26 | 2020-present
BMW X3 M40i: G01 | 2017-present
BMW X4 M40i: G02 | 2018-present
BMW X5 xDrive40i: G05 | 2019-present
BMW X6 xDrive40i: G06 | 2020-present
BMW X7 xDrive40i: G07 | 2019-present
BMW Z4 M40i: G29 | 2019-present

Notes

Filter is not included
Excessive heat for prolonged periods of time can affect the overall finish, which is unavoidable with anodized aluminum products; function is not affected

Frequently Asked Questions

Why does the OEM B58 oil filter housing cap need replacing? The factory plastic oil filter housing cap on the B58 becomes brittle over years of heat cycling and the repeated torque applied at every oil service, eventually leading to cracking and oil leaks. The BMW B58 oil filter housing cap from MMX replaces it with billet aluminum, which does not degrade the same way, removing that failure point permanently.
Do I need a new O-ring to install this BMW B58 oil filter housing cap? No. The cap is engineered for direct compatibility with the OEM O-ring, so the existing factory O-ring is reused during installation. There is no need to purchase a separate seal.
Is the oil filter included with this BMW B58 oil filter housing cap? No. This listing is for the housing cap only; the filter is not included. MMX also offers a stainless steel lifetime oil filter for B58 engines, as well as a complete oil filter kit that bundles the housing cap, filter, and magnetic sump plug together.
Will the anodized finish discolor under engine bay heat? Prolonged exposure to excessive heat can affect the appearance of any anodized aluminum finish, which is an inherent characteristic of the anodizing process rather than a product defect. This does not affect the cap’s function or sealing performance, only its cosmetic appearance over extended periods.
How long does installation take? The BMW B58 oil filter housing cap is a direct, bolt-on replacement for the factory cap with no special tools required beyond those already used during a routine oil service. Most owners fit it in a few minutes as part of an existing oil 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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MMX Billet Oil Filter Housing Cap for BMW Vehicles (with B58 engine) [MMR17-1501]

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MMX Billet Oil Filter Housing Cap for BMW Vehicles with B58 Engine

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Frequently Asked Questions

About MMX Performance

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