Upgrade a commonly overlooked engine bay detail with the Goldenwrench Blackline Performance BMW M Car G-Chassis Washer Fluid Cap. Designed as a complete replacement for the factory plastic unit, this billet aluminum cap delivers both functional improvement and a premium motorsport aesthetic for BMW M G-chassis vehicles.

Engineered with no-spill seal technology, the Goldenwrench Blackline Performance BMW M Car G-Chassis Washer Fluid Cap addresses a known weakness of the OEM reservoir by eliminating washer fluid seepage under spirited driving or temperature changes. Each cap is precision CNC-machined from T6 aluminum and finished in a race-inspired anodized red, offering exceptional durability and a refined visual upgrade.

Branding and detailing are permanently machined into the cap using advanced 3D milling—no decals or surface treatments—ensuring a lasting, high-end finish. This BMW M washer fluid cap installs in minutes and replaces the factory cap entirely, making it a simple yet impactful enhancement to your engine bay.

Designed specifically for modern M vehicles, the BMW G-chassis washer fluid cap delivers OEM-level fitment with enthusiast-grade execution.

Key Features:

Full replacement billet washer fluid cap for BMW M G-chassis vehicles

CNC-machined from T6 aluminum for strength and precision

Integrated no-spill seal technology to prevent reservoir leakage

Race-inspired anodized finish with precision-milled branding

Quick, tool-free installation using the factory mounting location

Vehicle Fitment:

G87 M2

G80 M3

G82 / G83 M4

F90 M5

G90 / G99 M5