Oil Caps

Oil Caps: the small threaded part that seals your valve cover

An oil fill cap threads into the valve cover or oil fill neck and seals the top of the engine so oil vapor and pressure stay where they belong. Aftermarket oil caps do the same sealing job as the factory part, usually with a better O-ring seat and a positive-locking design that is easier to grip with oily hands. Some are baffled or vented to help manage crankcase pressure. Most buyers fit one because the OE plastic cap has cracked or stripped, or because they want a billet or titanium piece that matches the rest of the engine bay.

What we stock

There are 22 oil caps in this category from 12 brands, with current in-stock pricing from $32 to $136 (that range reflects what is on the shelf now, not a locked price). Brands here include Perrin Performance, Radium Engineering, Skunk2 Racing, BLOX Racing, Fleece Performance, Wehrli, AMS, Torque Solution, Turbo XS, Mishimoto and COBB.

Concrete examples: the BLOX Racing Xtreme Line Titanium Honda Oil Cap sits near the top of the range, the Radium GM Baffled VTE Kit Oil Cap and Radium GM LS Baffled Oil Cap cover baffled GM applications, the COBB Delrin Oil Cap fits 2002+ WRX and 2004+ STI/Forester XT, and the AMS Performance Subaru Billet Oil Cap is a billet Subaru option.

How to choose

Fitment comes first: these are threaded to a specific valve cover, so match the cap to your engine, not just your make. Of the range, 7 products list confirmed fitment, and the makes that show up are Subaru, GM and Dodge across a 1989-2024 span, with WRX, STI, Forester XT, GM Duramax/2500/3500 and Dodge Cummins among the listed vehicles. Product names also call out Subaru and Honda.

  • Baffled/vented caps like the Radium units are aimed at engines where crankcase pressure management matters.
  • Billet aluminum and Delrin caps trade a little weight and finish choice for durability over cracked plastic.
  • Titanium, like the BLOX cap, is the premium end of the price spread, mostly a material and finish choice.
  • Color counts too - the Perrin WRX/BRZ/GR86 Hyper Pink Oil Fill Cap is one of several finish options.

What else you need

An oil cap change pairs naturally with a service. Browse Oil Filters for the same interval, and if you are chasing leaks look at Gasket Kits and Head Gaskets. For plumbing and catch-can work you'll find Fittings and Adapters in the same section. See the full Engine Components section for everything else.

Fitment help and ordering

Not sure a cap threads to your valve cover? Call our fitment line at 813-535-5801 or reach out through contact us. All orders ship free, and Affirm and Katapult financing is available at checkout.

Oil Caps: the small threaded part that seals your valve cover

An oil fill cap threads into the valve cover or oil fill neck and seals the top of the engine so oil vapor and pressure stay where they belong. Aftermarket oil caps do the same sealing job as the factory part, usually with a better O-ring seat and a positive-locking design that is easier to grip with oily hands. Some are baffled or vented to help manage crankcase pressure. Most buyers fit one because the OE plastic cap has cracked or stripped, or because they want a billet or titanium piece that matches the rest of the engine bay.

What we stock

There are 22 oil caps in this category from 12 brands, with current in-stock pricing from $32 to $136 (that range reflects what is on the shelf now, not a locked price). Brands here include Perrin Performance, Radium Engineering, Skunk2 Racing, BLOX Racing, Fleece Performance, Wehrli, AMS, Torque Solution, Turbo XS, Mishimoto and COBB.

Concrete examples: the BLOX Racing Xtreme Line Titanium Honda Oil Cap sits near the top of the range, the Radium GM Baffled VTE Kit Oil Cap and Radium GM LS Baffled Oil Cap cover baffled GM applications, the COBB Delrin Oil Cap fits 2002+ WRX and 2004+ STI/Forester XT, and the AMS Performance Subaru Billet Oil Cap is a billet Subaru option.

How to choose

Fitment comes first: these are threaded to a specific valve cover, so match the cap to your engine, not just your make. Of the range, 7 products list confirmed fitment, and the makes that show up are Subaru, GM and Dodge across a 1989-2024 span, with WRX, STI, Forester XT, GM Duramax/2500/3500 and Dodge Cummins among the listed vehicles. Product names also call out Subaru and Honda.

  • Baffled/vented caps like the Radium units are aimed at engines where crankcase pressure management matters.
  • Billet aluminum and Delrin caps trade a little weight and finish choice for durability over cracked plastic.
  • Titanium, like the BLOX cap, is the premium end of the price spread, mostly a material and finish choice.
  • Color counts too - the Perrin WRX/BRZ/GR86 Hyper Pink Oil Fill Cap is one of several finish options.

What else you need

An oil cap change pairs naturally with a service. Browse Oil Filters for the same interval, and if you are chasing leaks look at Gasket Kits and Head Gaskets. For plumbing and catch-can work you'll find Fittings and Adapters in the same section. See the full Engine Components section for everything else.

Fitment help and ordering

Not sure a cap threads to your valve cover? Call our fitment line at 813-535-5801 or reach out through contact us. All orders ship free, and Affirm and Katapult financing is available at checkout.