MMX BMW S58 billet oil filer cap The MMX Performance billet oil filler cap for BMW S58 and B48E engines has been designed from the ground up in the UK, from a solid piece of billet aluminium. Each cap is designed to directly replace the OE cap, not merely stuck in place. Each MMX cap starts life as a solid billet of 6061 aerospace-grade aluminium. It's meticulously machined from this billet with the latest CNC 5-axis technology, before being polished, then gloss-anodised to stay beautiful year after year. All MMX oil caps arrive pre-sealed and pre-installed with an OE spec valve and internal spring. No need to remove the valve assembly from your OE cap. A true plug and play solution. It has been designed to instantly give your BMW an under-bonnet boost in the aesthetic department, finished in a deep gloss black anodised finish. Never again will you worry whether you tightened your oil cap fully, as the cap contains complete OE replacement internals. The carefully considered design gives ample surface grip area for your fingers, making installation and filling your coolant that little bit easier. It joins an existing range of engine dress-up products for a complete under-bonnet transformation to your engine bay. The carefully considered design gives ample surface grip area for your fingers, making installation and filling your engine oil that little bit easier. Features Designed and engineered in the UK Crafted from 6061 aerospace-grade aluminium Full OE cap replacement, not just a cover Internally sprung clip for secure and precise fit Anodised in MMX signature gloss black Joins existing range of MMX billet caps Pre-installed factory spec Viton O-Ring Additional Information Please note if the part is under excessive heat for prolonged periods of time, it can affect the overall finish, which is unavoidable with anodised aluminium products. Fitting Information All MMX caps arrive pre-sealed and pre-installed with an OE spec valve and internal spring. No need to remove the valve assembly from your OE cap. A true plug and play solution. Vehicle Fitment Model variant Please check the underside of your factory oil cap for the OE part number. The MMX billet oil cap for the S58 and B48E fits OE part number 11 12 8 654 637