MMX Billet Oil Filter Housing Cap for BMW Vehicles with N20, N52, N54, N55, or S55 Engines
BMW oil filter housing cap from MMX Performance is a precision-engineered billet replacement for the factory plastic cap fitted across N20, N52, N54, N55, and S55-powered BMW models covering the majority of BMW’s mainstream 4 and 6-cylinder turbo and naturally aspirated lineup from the early 2000s through to the F8x M cars. The OEM plastic housing cap is a known weak point: years of heat cycling and routine oil service torque cause it to become brittle, leading to cracking that can develop into an oil leak directly at the filter housing. The MMX BMW oil filter housing cap replaces it with a CNC-machined billet aluminum unit, finished in polished dark anthracite anodizing for a refined, motorsport-inspired engine bay appearance while removing that failure point entirely. It is designed to reuse the factory O-ring, so no separate seal purchase is needed, and it installs in place of the original cap with no special tools — ideally fitted during a routine oil and filter service when the cap is already accessible. Compatible across a huge range of N-series and S55-powered models, including the 1, 2, 3, 4, 5, 6, and 7 Series, M2, M2 Competition, M3, M4, X1, X3, X4, X5, X6, and Z4.
Features
- CNC-machined from 6061 billet aerospace-grade aluminum
- Eliminates the cracking and oil leak risk of the OEM plastic cap
- Reuses the factory O-ring — no separate seal needed
- Polished dark anthracite anodized finish
- Full OE cap replacement; installs with no special tools
- Designed in the UK
- Part of MMX’s existing range of billet caps
Applications
- BMW 1M Coupe: E82 | 2011
- BMW 1 Series: E81, E82, E87, E88, F20, F21 | 2004-2015
- BMW 2 Series: F22, F23 | 2014-2016
- BMW 3 Series: E90, E91, E92, E93, F30, F31, F34 | 2005-2016
- BMW 4 Series: F32, F33, F36 | 2013-2016
- BMW 5 Series: E60, E61, F07, F10, F11 | 2005-2016
- BMW 6 Series: E63, E64, F06, F12, F13 | 2004-2018
- BMW 7 Series: E65, E66, F01, F02 | 2005-2008, 2011-2015
- BMW M2: F87 | 2016-2018
- BMW M2 Competition: F87 | 2018-2021
- BMW M3: F80 | 2014-2018
- BMW M4: F82, F83 | 2014-2020
- BMW X1: E84 | 2009-2015
- BMW X3: E83, F25 | 2006-2017
- BMW X4: F26 | 2014-2018
- BMW X5: E70, F15 | 2007-2018
- BMW X6: E71, F16 | 2008-2010
- BMW Z4: E85, E86, E89 | 2005-2016
Frequently Asked Questions
- Why does the OEM oil filter housing cap need replacing? The factory plastic oil filter housing cap becomes brittle over years of heat cycling and the repeated torque applied at every oil service. That brittleness eventually leads to cracking, which can develop into an oil leak directly at the filter housing. The BMW oil filter housing cap from MMX replaces the plastic part with a billet aluminum unit that does not degrade the same way, removing that failure point permanently.
- Do I need a new O-ring to install this BMW oil filter housing cap? No. The MMX BMW oil filter housing cap is designed to reuse the factory O-ring from the original plastic cap, so no separate seal purchase is required. Simply transfer the existing O-ring across during installation.
- Which engines is this BMW oil filter housing cap compatible with? The cap fits N20, N52, N54, N55, and S55-powered BMW models, spanning the 1 through 7 Series, M2, M2 Competition, M3, M4, X1, X3, X4, X5, X6, and Z4. The full chassis and engine breakdown for each model is listed in the Applications section above.
- When is the best time to install this cap? The BMW oil filter housing cap is best installed during a routine oil and filter service, since the housing is already accessible and the factory O-ring is already exposed for transfer at that point. No additional disassembly is required beyond what a standard oil change already involves.
- Will the anodized finish hold up under the bonnet? Yes. The polished dark anthracite anodizing is applied directly to the aluminum surface rather than painted on, giving it resistance to engine bay heat, oil exposure, and routine cleaning. It will not peel or flake under normal conditions.
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.
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