The MMX Performance BMW B58 / B57 Billet Oil Filter Housing Cap is a precision-engineered replacement designed to eliminate the common failures associated with the factory plastic oil filter housing. BMW’s OEM plastic cap is known to crack or deform during routine servicing, often leading to oil seepage and unreliable sealing. This billet upgrade provides a permanent solution with improved durability, sealing integrity, and long-term confidence.

Each MMX billet oil filter housing cap is CNC-machined from a solid block of 6061 aerospace-grade aluminum, ensuring exceptional strength while remaining lightweight. The cap is finished in a durable Midnight Black anodized coating, delivering a refined OEM+ appearance that holds up to repeated heat cycles and regular maintenance.

Beyond aesthetics, this billet oil filter housing cap is engineered for functional superiority. An integrated pressure control oil bypass is built directly into the housing, removing the need to transfer the fragile OEM plastic bypass valve—an operation that frequently results in damaged components on other aftermarket solutions. This integrated design ensures consistent oil flow and pressure regulation without relying on failure-prone factory parts.

Installation of the MMX Performance BMW B58 / B57 Billet Oil Filter Housing Cap is straightforward and best completed during a standard oil and filter service. The cap installs directly in place of the factory unit and includes a factory-spec O-ring for proper sealing and leak-free operation. It is fully compatible with the factory oil filter and pairs ideally with the MMX Performance stainless steel oil filter to address the well-documented B58 paper filter collapse issue.

Designed for both daily-driven vehicles and performance-focused builds, this BMW oil filter housing cap is an essential upgrade for owners seeking improved reliability, cleaner engine bays, and long-term peace of mind.

Key Features & Benefits:

CNC-machined 6061 billet aluminum construction

Direct replacement for factory plastic housing cap

Integrated oil pressure bypass system

Eliminates risk of cracking and oil leaks

Includes factory-spec O-ring for proper sealing

Compatible with OEM and MMX performance oil filters

Note: Prolonged exposure to extreme heat may cause slight changes to the anodized finish over time. This is inherent to anodized aluminum and does not affect performance or function.