The MMX Performance BMW G-Series Washer Fluid Filler Cap replaces the cheap factory plastic washer cap with a precision-machined billet aluminium upgrade. It’s all about the detail. Where the OEM cap sits as a flat plastic afterthought against an otherwise impressive G-Chassis engine bay, the MMX cap turns the washer reservoir into a finished feature.

Each cap is CNC 5-axis machined from a solid block of 6061-T6 aerospace-grade aluminium, hand-polished, then anodised in MMX signature gloss black. Unlike stick-on covers, it’s a complete replacement, the OEM plastic cap is removed and the MMX cap takes its place, threading directly to the reservoir. Each unit is precision-sealed for a perfect, leak-free fit.

The cap joins MMX’s existing range of billet under-bonnet dress-up parts (oil filler cap, coolant cap, A/C caps), letting you build a coordinated, fully finished engine bay one piece at a time. UK-engineered, motorsport-quality machining, for one of the easiest visual upgrades you can make to a G-chassis BMW.

Product Details

• CNC 5-axis machined from 6061-T6 aerospace-grade aluminium
• Gloss black anodised finish (MMX signature colour)
• Hand-polished before anodising
• Full OE cap replacement: not a stick-on cover
• Pre-sealed for a precise, leak-free fit
• SKU: MMR03-0002

Notes

• Includes a 1-year manufacturer warranty against defects in materials and workmanship
• Designed and tested in the United Kingdom

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