MMR Billet Oil Thermostat Cover/Lid & Caps for BMW N54 N55 S55 - Black Anodised T6061 Aluminium - Optional 1/8 NPT Sensor Port

Refresh your under-bonnet look with this MMR oil stat housing top and matching cap set in deep black. Crafted in-house by MMR from T6061 billet aluminium and hard anodised for long-lasting protection, it replaces the factory top and caps on turbocharged BMW straight‑six engines coded N54, N55 and S55. The result is a premium, motorsport-inspired appearance with precise fitment and a stealthy OE style finish that lifts the whole engine bay.

We run this exact MMR kit on our own builds and customer cars. The fit and finish are outstanding, the machining is crisp and the black anodised surface looks subtle yet purposeful. If you are building a show-worthy bay or simply want a clean, cohesive look, this is the small detail that makes a big difference.

Highlights

• Engine-specific fit for BMW N54, N55 and S55 powertrains for a neat, rattle‑free installation
• Machined from solid T6061 billet aluminium for strength, accuracy and a lightweight upgrade
• Black anodised for a durable, corrosion resistant, OE-plus appearance
• Transforms the thermostat area with a premium dress-up part that complements other engine bay upgrades
• Optional 1/8 NPT take-off to add an oil pressure sender or oil temperature probe for gauges or logging
• Simple bolt-on swap with hand tools, no cutting or permanent changes required

Why enthusiasts choose this kit

Precision CNC work, quality materials and an understated finish make this cap and cover set an easy win for any N54, N55 or S55 owner. It is a tidy, reliable upgrade that elevates the look without screaming for attention. Our customers consistently praise the snug fit, the premium feel and the way it ties the whole bay together.

Technical details

• Brand: MMR
• Material: T6061 billet aluminium
• Finish: Black anodised
• Compatibility: BMW engines N54, N55, S55
• Sensor option: 1/8 NPT threaded port for senders and gauge adapters

Compatibility

Designed for vehicles equipped with BMW N54, N55 or S55 engines. If you would like us to confirm suitability for your specific car, get in touch and we will be happy to help.

Installation

This is a straightforward bolt-on upgrade using common tools. Prefer a professional fit and peace of mind. Book with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Sensor take-off option

Planning to run an oil temperature gauge or oil pressure gauge. Select the version with the 1/8 NPT threaded port to add a sender neatly and securely.

In the box

• MMR oil stat housing top in black anodised billet aluminium
• Matching MMR caps in black anodised billet aluminium
• Optional 1/8 NPT sensor adaptor piece if selected

Notes

As with any anodised aluminium located near heat sources, cosmetic colour shift can occur over time. This is normal and does not affect function.

Why buy from MJ Modifications

We specialise in BMW performance parts and live with these engines every day. We use this MMR housing top and cap set on our own cars and our customers rate it highly for fitment and finish. Order with confidence and give your engine bay the premium look it deserves.

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