The follow up to GoldenWrench’s highly anticipated summer release, the Billet Oil Cap Cover, is here: the all new BMW M Car Series Billet Coolant Expansion Tank Cap Cover. This is one of GoldenWrench’s most complex components to date, meticulously designed and produced in house to the same high precision and quality found across their lineup, giving the factory unit an all new form factor. It is the newest addition to the BLACKLINE Performance product line for BMW M vehicles.

Upgrade the plain plastic factory coolant cap with the BLACKLINE Performance Coolant Expansion Tank Cap Cover. Each cover is CNC formed from T6 aluminum and anodized in your choice of three colors: Anthracite Grey, Blue, or Red. Logos and detailing are completed using GoldenWrench’s precision 3D milling process, machined directly into each cap for a crisp, premium finish.

Fitment includes most BMW vehicles equipped with the N55, S55, S63, and S65 engines that use the large coolant tank and matching cap shape shown in the product photos, including E90 E91 E92 M3 LCI, F22 M235i, F87 M2 and M2 Competition, F80 M3, F82 M4, F10 and F90 M5, and more. Please verify your coolant cap shape matches the product photos before ordering.

Each kit includes a Billet Coolant Expansion Tank Cap Cover and an installation instruction card. This is not a full cap replacement. The billet cover mounts to the top of the factory coolant cap and installs in minutes.