MMR Performance Billet Oil Filler Cap Mini F5x (F56 F55 F57 F54) B38 B48 B37 B47 Black Anodised CNC 6061 Aluminium Cooper, Cooper S & JCW Positive-Lock Upgrade

Billet Alloy Engine Oil Cap Upgrade for BMW MINI F-Series B38 B48 B37 B47 in Black

Transform your MINI’s engine bay with this premium black anodised billet alloy oil cap. Precision CNC machined from 6061 aluminium for an OEM-like fit, it replaces the flimsy plastic cover with a solid, performance-focused cap that looks superb and locks with confidence. The spring-loaded positive locking mechanism gives a secure click every time, helping to reduce the light misting that can occur with tired factory caps while making routine top-ups quicker and cleaner.

If you are searching for a MINI F-series engine oil cap, F56 hatch oil filler cover, F55 5-door replacement cap, F57 convertible oil lid, F54 Clubman alloy rocker cover cap, B38 or B48 petrol oil cap, B37 or B47 diesel cam cover cap, black aluminium oil filler, CNC 6061-T6 oil cap or positive lock oil cap for Cooper, Cooper S and JCW models, this is the upgrade you are looking for. We have installed this cap on our own cars and for customers, and the feedback on fit, finish and feel has been outstanding.

Key benefits

• Aerospace-grade 6061 billet aluminium with precision 5-axis CNC machining
• Deep black anodised finish for a clean, stealth under-bonnet look
• Internally sprung positive-lock action for secure sealing and confident removal
• Helps minimise weeping from ageing plastic caps on higher mileage engines
• Improved knurled-style grip for easy opening, even with gloves
• Logo alignment at 0 or 90 degrees for a tidy, show-car presentation
• Perfect engine bay dress-up and performance styling upgrade

Compatibility

Fits MINI F-series models using the rounded factory filler cap as shown in the images, across the following engine families:

• B38 and B48 petrol engines
• B37 and B47 diesel engines

Suitable for F56 Hatch, F55 5 Door, F57 Convertible and F54 Clubman variants including Cooper, Cooper S and JCW. For peace of mind, compare the underside of your existing cap to the images or cross-reference the OE cap style below.

OE reference for cap style confirmation: 11128655331.

Installation

• Direct replacement for the stock oil cap
• Please re-use your original oil cap seal
• Professional fitting available at MJ Modifications, Warwickshire. Email info@mjmodifications.co.uk for a quote

Care notes

• Like all anodised aluminium parts, colour tone may evolve with prolonged exposure to high heat

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