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
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
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
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
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
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
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
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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

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Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

MMR Performance Billet Oil Filler Cap for Mini F5x, black anodised, CNC machined 6061 aluminium

Upgrade your Mini engine bay with the MMR Performance Billet Oil Filler Cap for all Mini F5x engines. This premium black anodised billet aluminium oil cap delivers a perfect blend of performance, quality and style. It replaces the factory oil cap to give an instant under-bonnet transformation, improves grip for easy oil top ups, and uses an internally sprung, positive locking action to help prevent the common weeping oil issue that can occur with ageing OEM caps.

If you are searching for Mini F5x oil filler cap, Mini F56 oil filler cap, Mini Cooper S oil cap, Mini JCW oil cap, billet aluminium oil filler cap, black oil filler cap Mini, MMR Performance oil cap, or Mini B38 B48 B37 B47 oil cap replacement, this is the exact upgrade you want. We have fitted and used these ourselves and customer feedback has been consistently excellent on the fit, finish and feel.

MMR Performance Billet Oil Filler Cap Mini F5x F56 black anodised CNC 6061

Why choose the MMR billet oil filler cap

  • Premium billet 6061 aerospace-grade aluminium, CNC 5-axis machined for a precise OEM-like fit
  • Deep gloss black anodised finish for a stealth, factory-plus look
  • Internally sprung mechanism clicks and locks into place for confident sealing
  • Helps prevent weeping oil from tired factory caps on older, higher mileage engines
  • Updated design allows 0 or 90 degree installation for perfect logo alignment
  • Improved grip area makes removal and oil filling easier, even with gloves
  • Ideal engine bay dress-up, under-bonnet styling and performance aesthetic upgrade

MMR Billet Oil Cap vs factory oil cap Mini F56 F5x upgrade

Fitment and compatibility

Fits all Mini F5x engines with the rounded factory filler cap that matches the underside shown in the product images. This includes B38, B48, B37 and B47 engine families. Perfect upgrade for Mini F56 Hatch, F55 5 Door, F57 Convertible and F54 Clubman owners looking for a high quality Mini Cooper, Cooper S and JCW oil filler cap upgrade.

To confirm compatibility, check your factory oil cap underside against the images, or cross reference the OE cap design noted below.

Reference OE Part Number for cap style confirmation: 11128655331.

Installation and support

  • Direct replacement for the original oil filler cap
  • Please re-use your original oil filler cap seal
  • If you prefer professional fitting, Nforcd can install this at our Warwickshire workshop, request a quote at Sales@nforcd.com

Notes

  • Anodised aluminium finishes can change if subjected to prolonged excessive heat, this is normal for anodised products
  • Title keywords for search: OIL FILLER CAP, BILLET, ALL MINI F5x, Mini F56 oil cap, Mini Cooper S oil filler cap, MMR Performance oil cap, billet aluminium oil cap