WARNING: This product can expose you to chemicals that are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.Upgrade your BMW or Mini’s engine bay with the MMX Performance 60mm Billet Coolant Expansion Cap. Precision-engineered in the UK, this cap is crafted from 6061 aerospace-grade aluminum, offering a perfect balance of durability and style.
Each cap is CNC-machined using advanced 5-axis technology, then polished and gloss-anodized in MMX's signature black finish for long-lasting beauty. This high-quality replacement doesn’t just look great—it comes pre-installed with a factory-spec valve and Viton O-ring for seamless plug-and-play installation. There's no need to transfer any components from your OEM cap.
Designed to be more than just a cosmetic upgrade, this billet cap enhances functionality with its OE-spec internal spring and bleed-off system. Its ergonomic design offers extra grip, making it easier to tighten or remove—so you’ll never second-guess if it’s properly secured.
Key Features:
- UK-designed and engineered from aerospace-grade 6061 aluminum
- CNC-machined with precision for superior quality
- Full OE cap replacement, not just a cover
- Advanced internal spring and bleed-off system for reliable performance
- Gloss black anodized finish for lasting durability
- Pre-installed with a factory-spec Viton O-ring for easy installation
- Complements the full range of MMR billet caps
Fitment Note:
Although great effort has been made to directly confirm fitment on every model of BMW & MINI, on the odd occasion models can be missed. Please check the underside of your factory expansion cap for the OE part number. It’s a smaller cap, measuring roughly 60mm in diameter. The MMR billet coolant expansion cap for MINI fits OE part number 17 11 7 639 024.
