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Ditch the dull plastic. Upgrade your engine bay with a precision-crafted billet aluminum oil cap from R Theory Motorsports — designed to stand out every time you pop the hood and built to last a lifetime.
Machined from a solid block of 6061-T6 aluminum and finished in your choice of Black Anodized, Blue Anodized, or Nickel Chrome, this cap brings clean, motorsport-inspired aesthetics and uncompromising reliability to the top of your engine. The laser-etched R Theory logo adds a subtle, professional touch that sets your build apart.
Why ours stands above the rest:
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No two-piece gimmicks – Unlike modular designs that can loosen over time, our one-piece construction eliminates the risk of misalignment or separation. Just tighten and go—worry-free.
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Raised center rib for easy removal – Our integrated center rib provides a solid grip point, making removal quick and easy, even with gloves or when hot.
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Leak-free performance – Comes equipped with a standard-size rubber O-ring to maintain a consistent, tight seal through countless heat cycles.
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Built to handle the heat – Anodized or nickel-chromed to resist corrosion, staining, and discoloration—even in high-temp engine bays.
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Show-worthy finish, track-ready strength – A refined appearance that complements even the cleanest builds, with durability that stands up to real-world abuse.
Fitment:
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All NC & ND Miatas (2006–2024, including NC2, NC3, ND2, and ND3)
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All Mazda Skyactiv engines (CX-3, CX-30, CX-5, CX-50, CX-7, CX-9, and more)
Whether you're chasing lap times or just enjoying the drive, the R Theory Motorsports Billet Oil Cap adds that perfect touch of form and function under the hood.
