MMX Performance G8X M2 / M3 / M4 Washer Fluid Filler Cap

Upgrade the small detail everyone sees when the hood is up. The MMX billet washer fluid filler cap replaces the flimsy factory plastic cap with a precision CNC-machined 6061-T6 aluminum piece, black anodized for a durable, OEM-plus finish. Designed and engineered in the UK, this is a full OE replacement (not a stick-on cover) that delivers a refined look and premium feel.

Built on modern 5-axis machining, each cap is shaped to tight tolerances, hand finished, and pre-sealed for a leak-free fit. It’s the perfect finishing touch to the MMX range of billet caps.

Key features

• Fitment: BMW M3/M4 G80/G81/G82/G83 and M2 G87
• Construction: 6061-T6 aluminum, CNC 5-axis machined
• Finish: Black anodized (non-gloss) for scratch, corrosion, and UV resistance
• Design: Full OE cap replacement for seamless integration (not a cover)
• Seal: Pre-sealed for a precise, leak-free connection
• Engineering: Designed and engineered in the UK
• Look: Clean OEM+ appearance for a tidier engine bay

Why upgrade

• Replaces lightweight plastic with a solid, confidence-inspiring billet part
• Elevates overall engine-bay presentation
• Complements other MMX billet caps for a unified look

What’s included

• 1 × MMX Billet Washer Fluid Filler Cap (black anodized, pre-sealed)