Fits select 1993-2024 Ford and Lincoln vehicles, including Crown Victoria, Expedition, Explorer, F-150, F-250/F-350 Super Duty, and Town Car.

The Gates 31406 threaded coolant bottle cap is a critical component for maintaining the integrity of your vehicle's closed cooling system. Engineered to hold a consistent 16 PSI, this expansion tank cap raises the boiling point of your coolant to prevent overheating and ensure efficient heat transfer under load. It serves as a direct replacement for worn or damaged OE caps that no longer hold pressure, preventing coolant loss and system contamination.

• Manufacturer Part Number: 31406
• Pressure Rating: 16 PSI (110 kPa)
• Mounting Type: Threaded
• System Compatibility: Closed System
• Construction: Durable automotive-grade composite housing
• Function: Regulates expansion tank pressure and seals cooling system

Fits Toyota GR Supra MKV and BMW M340i / M340iX models.

The Torque Solution Billet Resonator Cap (TS-GR-643) provides a precision-engineered solution for capping the intake resonator on the B58 engine platform. CNC machined from high-grade 6061 billet aluminum, this cap replaces the factory plastic unit with a more durable, heat-resistant component that maintains a secure seal. It is an essential upgrade for owners looking to clean up the engine bay aesthetics while ensuring long-term reliability on modified intake systems.

• Precision CNC machined from 6061 billet aluminum
• Durable black anodized finish for corrosion and heat resistance
• Engineered for a direct, leak-free fit on the factory intake resonator port
• Simplifies the intake tract for a cleaner engine bay appearance
• Manufacturer Part Number: TS-GR-643

Fits 2017 Honda Civic EX, LX, Si, Sport, and Type R (1.5T).

Clean up your engine bay with the Turbo XS Red Oil Cap. This cap (HC-OC-RED-SI) is designed as a direct-fit replacement for the factory oil filler cap, providing a secure, leak-free seal while adding a high-contrast accent to the engine compartment. Precision-manufactured for a perfect fit on the 1.5T and other compatible Honda valve covers, it offers a durable alternative to the standard plastic component.

• Manufacturer Part Number: HC-OC-RED-SI
• Product Type: Oil Filler Cap
• Finish: Red
• Installation: Direct-fit replacement
• Compatibility: Specific to 2017 Honda Civic models

Fits select 1993-2020 Subaru (Impreza, WRX, STI, Forester, Legacy, Crosstrek, BRZ), 2013-2016 Scion FR-S, and 2017 Toyota 86.

The Torque Solution Billet Breather Oil Cap is designed to relieve excessive crankcase pressure, a critical requirement for high-performance and forced induction engines. By replacing the standard factory oil cap with this breather unit, you allow the engine to vent more effectively, reducing the risk of seal failure and blow-by. Each cap is CNC machined from high-grade billet aluminum for superior durability compared to the original plastic component.

• Manufacturer Part Number: TS-SU-313-12
• Material: CNC Machined Billet Aluminum
• Finish: Durable anodized surface
• Integrated breather port for improved crankcase ventilation
• Direct replacement for the factory oil cap

Fits select 1986-2011 Acura and Honda models, including Integra, Civic, Accord, RSX, S2000, CR-V, and Element (M33 x 2.8 thread pitch).

Skunk2 Hard Series Billet Oil Caps provide the final precision touch for your valve cover, combining race-inspired aesthetics with rugged durability. These caps are precision CNC-machined from high-grade billet aluminum to ensure exact tolerances and a reliable seal for the oil system. As part of the Skunk2 "Fine Tuning" line, they are designed for enthusiasts who require performance components that look as good as they function.

Each cap features a signature gun metal hard-anodized finish that resists heat and chemical degradation common in performance engine bays. The look is completed with a contrasting, acid-etched Skunk2 logo for a high-end, durable finish that will not fade or peel over time.

• Manufacturer Part Number: 626-99-0072
• Thread Pitch: M33 x 2.8 (33mm x 2.8mm)
• Material: CNC Machined Billet Aluminum
• Finish: Hard Anodized Gun Metal
• Logo: Acid-Etched Skunk2 Graphic
• Compatibility: Designed for most Honda/Acura valve covers

Fits select 1986-2011 Acura and Honda models, including Integra, RSX, Civic, Accord, CR-V, S2000, and Prelude.

The Skunk2 Black Series Billet Oil Cap provides a precision-engineered finishing touch to your engine bay. Built to the same exacting standards as Skunk2's racing components, each cap is CNC machined from high-quality billet aluminum for a perfect fit and long-term durability. The M33 x 2.8 thread pitch ensures compatibility with most Honda factory and aftermarket valve covers.

This Black Series edition features a durable black anodized finish for a stealthy, high-performance look, complete with a contrasting acid-etched Skunk2 logo. It serves as a direct, technical upgrade over the factory plastic cap, offering superior heat resistance and a more secure seal for enthusiasts who demand better-than-OE performance and aesthetics.

• Manufacturer Part Number: 626-99-0071
• Thread Pitch: M33 x 2.8
• Material: CNC Machined Billet Aluminum
• Finish: Black Series Anodized
• Acid-etched Skunk2 logo for a professional appearance

Fits select 1986-2011 Acura and Honda vehicles including Integra, RSX, Civic, Accord, S2000, and Element.

The Skunk2 Fine Tuning Polished Billet Oil Cap provides a high-performance alternative to the factory plastic cap, offering both durability and a refined engine bay aesthetic. Each cap is precision CNC machined from billet aluminum to ensure a perfect fit and long-term reliability under high engine temperatures.

Consistent with Skunk2's racing heritage, these caps feature an acid-etched logo for a clean, contrasting finish. They are designed to thread directly onto the factory valve cover, providing a secure seal for your oil fill neck.

• Precision CNC machined billet aluminum construction
• Thread Pitch: M33 x 2.8mm
• Finish: Fully polished for a show-quality shine
• Logo: Contrast acid-etched Skunk2 branding
• Manufacturer Part Number: 626-99-0070

The Radium Engineering Baffled Oil Cap (MPN: 20-0588) is a functional upgrade for GM LS V8 engines, replacing the factory oil filler cap with a baffled crankcase vent point. This kit is engineered to help manage internal crankcase pressure, which is essential for maintaining seal integrity and performance in high-RPM or forced induction applications.

The cap features an internal baffle design that effectively separates liquid oil from venting gases, ensuring that oil stays inside the engine while allowing the crankcase to breathe. It utilizes a center port that integrates with the included adapter fitting and a 2-inch breather filter.

• Direct replacement for the factory GM LS oil filler cap
• Integrated internal baffling to minimize oil carry-over
• Includes 10AN ORB center port and specific adapter fitting
• Includes 2-inch diameter breather filter with securing clamp
• Manufacturer Part Number: 20-0588

The Radium Engineering Baffled VTE (Vent-to-Engine) Kit replaces the standard oil filler cap with a high-flow engine vent port, designed specifically for select General Motors applications. This system creates a closed-loop ventilation path that pulls fresh air through the engine, offering a more robust solution for managing crankcase pressure than the factory OEM PCV setup.

The kit features a CNC-machined billet aluminum oil cap with an integrated internal baffle to help prevent oil slosh and vapor from escaping through the vent. By connecting the included billet PCV valve directly to the intake manifold using the provided hose, this kit ensures efficient air circulation while maintaining a sealed engine environment.

• CNC-machined 6061-T6 aluminum construction
• Internal baffle for improved oil-air separation
• High-flow billet aluminum PCV valve included
• Creates a high-performance closed-loop vent system
• Direct replacement for the factory oil fill cap
• Manufacturer Part Number: 20-0587

The Radium Engineering Oil Cap (MPN 20-0539) is a performance-oriented replacement for the factory oil fill cap found on many GM LS-series engines. This component is engineered to provide a secure seal while offering a path for advanced crankcase ventilation setups.

• Convertible Design: Features a removable center plug that allows the cap to be converted into a dedicated crankcase breather point.
• Customization: Once the plug is removed, secondary accessories can be installed to manage blow-by and crankcase pressure more effectively.
• Direct OE Replacement: Designed to install directly onto the factory oil neck without modification.
• Manufacturer Part Number: 20-0539

Ideal for forced induction or high-performance LS builds requiring additional ventilation options beyond the standard PCV system.

Fits 1993-2014 Subaru Impreza (Base, RS, Outback, 2.5i, and TS).

The PERRIN Oil Fill Cap (PSP-ENG-711RD) provides a clean, custom look for your engine bay while replacing the factory plastic cap. Each unit is CNC-machined from aluminum for a precise fit and features a vibrant red finish. This direct-fit component ensures a secure seal to prevent oil vapor leaks and resists the heat of high-performance driving.

• CNC-machined aluminum construction
• Vibrant red finish with PERRIN logo
• Direct replacement for factory plastic oil fill cap
• Includes high-quality O-ring for a leak-free seal
• Manufacturer Part Number: PSP-ENG-711RD

Fits select 2002-2026 Subaru Impreza, WRX, STI, and 2013-2026 Crosstrek, BRZ, Scion FR-S, and Toyota 86/GR86.

The PERRIN Oil Fill Cap (PSP-ENG-711NY) is a direct replacement for your factory plastic engine cap. Finished in high-visibility Neon Yellow, this component cleans up your engine bay while ensuring a secure, leak-free seal. It is designed for a straightforward installation using the factory O-ring for a reliable fit.

• Replaces the OEM plastic oil fill cap
• Vibrant Neon Yellow finish for high engine bay visibility
• Maintains a secure seal to prevent oil vapor leaks
• Compatible with many Subaru and Scion/Toyota Boxer engines
• Manufacturer Part Number: PSP-ENG-711NY

Fits select 2002-2026 Subaru Impreza, WRX, STI, and Crosstrek, as well as 2013-2025 BRZ, FR-S, and GR86.

The PERRIN Oil Fill Cap (PSP-ENG-711HP) provides a direct-fit aesthetic upgrade for your engine bay, replacing the factory plastic cap with a more durable and visually striking alternative. Finished in a bold Hyper Pink powder coat, this cap is designed to stand out while maintaining a reliable seal on your engine's oil fill neck. This is a simple, effective way to personalize your Boxer engine's appearance without compromising functionality.

• Direct replacement for the underwhelming factory plastic oil cap
• Finish: Durable Hyper Pink powder coating for heat and chemical resistance
• Design: Textured grip for easy removal and tightening during maintenance
• Fitment: Engineered for a precise fit on standard Subaru and Toyota oil fill necks
• Manufacturer Part Number: PSP-ENG-711HP

Fits select 2002-2026 Subaru Impreza, WRX, STI, and 2013-2026 Crosstrek, BRZ, FR-S, and GR86 models.

The PERRIN Oil Fill Cap (PSP-ENG-711BL) is a precision-engineered upgrade designed to replace the fragile factory plastic cap. Machined for a perfect fit and finished in a vibrant blue, this component provides a durable, heat-resistant seal while significantly enhancing the appearance of your engine bay.

• Direct replacement for the OEM oil filler cap
• High-quality construction with a corrosion-resistant blue finish
• Ensures a secure, leak-free seal for the engine oil system
• Engineered to withstand performance driving conditions
• Manufacturer Part Number: PSP-ENG-711BL

Fits select 1993-2016 Subaru Impreza, Forester, and Scion FR-S.

The PERRIN Black Oil Fill Cap (PSP-ENG-711BK) is a premium replacement for the standard factory component, providing a clean and professional appearance for your engine bay. Designed as a direct screw-on upgrade, it replaces the original equipment plastic cap with a more durable alternative. The cap features a textured perimeter for a secure grip, making it easy to remove and tighten during routine oil changes.

• Manufacturer Part Number: PSP-ENG-711BK
• Finish: Black
• Compatible Vehicles: Select 1993-2016 Subaru and Scion platforms
• Design: Direct replacement for OE plastic oil fill caps
• Installation: Simple screw-on fitment with no tools required

Fits select 1970-2011 Toyota, Lexus, Scion, Chevrolet, Geo, and Pontiac models.

Replace your brittle, plastic factory oil cap with the Mishimoto Billet Aluminum Oil Filler Cap. Precision CNC-machined from high-grade aluminum, this cap provides a significant upgrade in both durability and engine bay aesthetics. Each cap features a vibrant red anodized finish and includes a brand-new O-ring to ensure a leak-free seal and proper crankcase pressure retention, resolving common sealing issues found in aging OE components.

• Precision CNC-machined billet aluminum construction
• Durable red anodized finish for corrosion resistance
• Includes a new high-quality O-ring for a tight, reliable seal
• Engineered for an optimal fit and finish
• Direct replacement for the OEM oil filler cap
• Manufacturer Part Number: MMOFC-TOY-RD

The Mishimoto Billet Aluminum Oil Filler Cap is a premium upgrade for your engine bay, replacing the standard plastic factory cap with a durable, precision-engineered component. Fits select 1970-2011 Toyota, Lexus, Scion, Chevrolet, Geo, and Pontiac vehicles.

Constructed from CNC-machined 6061 billet aluminum, this cap provides a superior seal compared to stock units. The included high-quality O-ring ensures a leak-free fit, maintaining proper crankcase pressure and preventing oil seepage. Finished in a clean black anodized coating, it offers a refined look that complements any engine bay from vintage Celicas to modern Tundras.

• Precision CNC-machined from 6061 billet aluminum
• Durable black anodized finish for corrosion resistance
• Included O-ring ensures a tight, reliable seal
• Direct replacement for the factory oil cap
• Manufacturer Part Number: MMOFC-TOY-BK

Fits select 1989-2021 Subaru models including the Impreza, WRX, STI, Forester, Legacy, and Outback.

Give your engine bay a high-performance aesthetic while ensuring a dependable seal with the Mishimoto Billet Aluminum Oil Filler Cap. CNC-machined for precise tolerances, this cap replaces the factory plastic unit with a durable, heat-resistant alternative. The limited-edition pink finish is designed to complement Subaru-inspired color schemes, providing a custom look that won't degrade under high engine temperatures.

• CNC-machined from billet aluminum for optimal fit and long-term durability
• Limited-edition pink finish provides a clean, custom engine bay aesthetic
• Includes a new O-ring to ensure a perfect, leak-free seal
• Direct replacement for the factory oil filler cap
• Manufacturer Part Number: MMOFC-SUB-PK

Upgrade your engine bay with the Mishimoto Hoonigan Edition Oil Filler Cap. Designed in collaboration with Hoonigan, this cap replaces the factory plastic unit with a durable, CNC-machined billet aluminum component. It fits a wide range of vehicles, including select 1989-2021 Subaru models (Impreza, WRX, STI, Forester, Legacy, Outback) and 2013-2014 Scion FR-S / Subaru BRZ.

Constructed for both aesthetics and performance, the cap features a vibrant red anodized finish that resists heat and corrosion. Each unit includes a high-quality rubber O-ring to ensure a leak-free seal against the valve cover, preventing oil vapor or seepage from escaping the crankcase.

• Direct replacement for the factory oil filler cap
• Precision CNC-machined from billet aluminum for optimal fit
• Red anodized finish for enhanced durability and style
• Included O-ring ensures a tight, reliable seal
• Features collaborative Hoonigan branding
• Manufacturer Part Number: MMOFC-SUB-HOONRD

Upgrade your engine bay with the Mishimoto Gold Billet Aluminum Oil Filler Cap. Designed specifically for a precise fit on select 1989-2021 Subaru models and the 2013-2014 Scion FR-S, this cap replaces the factory plastic unit with a high-performance aesthetic and superior durability.

Constructed from CNC-machined billet aluminum, this filler cap offers significantly more strength than the OE alternative. The limited-edition gold finish provides a Subaru-inspired accent to your boxer engine's top end, while the included high-quality O-ring ensures a tight, leak-free seal to maintain proper crankcase pressure.

• CNC-machined from high-grade billet aluminum for optimal fit
• Limited-edition Subaru-inspired gold finish
• Included rubber O-ring ensures a leak-proof seal
• Direct replacement for factory oil filler caps
• Manufacturer Part Number: MMOFC-SUB-GD