Getadomtune Blow-by Retention Cap “Mostly Oil” Oil Cap Subaru WRX / STI / Forester XT / Legacy GT

Add Personality to Your Engine Bay While Keeping Things Sealed

Not every engine bay upgrade has to be serious. The GetaDomTune "Mostly Oil" Blow-By Retention Cap combines premium billet construction with the humor every Subaru enthusiast understands. Whether you're building a show car, weekend track toy, or daily-driven WRX or STI, this oil cap adds a unique touch that stands out every time the hood is opened. Inspired by the reality of crankcase blow-by and the mystery of what's really floating around inside your engine, the "Mostly Oil" design has become a favorite among Subaru enthusiasts.

Precision-Machined Billet Construction

Unlike factory plastic oil caps that can become worn or faded over time, the GetaDomTune Blow-By Retention Cap is built from quality materials designed to withstand the heat and abuse of a performance engine bay. Available with smooth or knurled finishes, it delivers improved grip during maintenance while providing a clean custom appearance. A new OEM-style O-ring is included to help ensure a proper seal.

Built for Subaru Enthusiasts

Anyone who's removed an oil cap on a running turbo Subaru has witnessed crankcase pressure and blow-by vapors firsthand. This cap embraces that reality with a humorous "Mostly Oil" graphic that instantly resonates with WRX, STI, Forester XT, and EJ-powered Subaru owners. It's the perfect conversation piece at car meets, track days, and weekend cruises.

Premium Engine Bay Styling

Finished in a vibrant green anodized color, this oil cap provides an easy way to add contrast and personality under the hood. Pair it with matching dress-up hardware, battery tie-downs, and other engine bay accessories to create a cohesive custom look that reflects your build.

Features

• Premium billet aluminum oil cap
• Unique "Mostly Oil" graphic design
• Bright green anodized finish
• Available in smooth or knurled configurations
• Includes new OEM-style sealing O-ring
• Direct replacement for factory oil filler cap
• Excellent engine bay dress-up modification
• Ideal for WRX, STI, Forester XT, and other Subaru applications
• Designed by GetaDomTune

Benefits

• Enhances engine bay appearance
• Improves grip during oil changes and maintenance
• Durable construction resists heat and corrosion
• Adds a unique enthusiast-focused touch to your build
• Direct installation with no modifications required

Whether you're chasing horsepower, cleaning up your engine bay, or simply adding a little humor to your build, the GetaDomTune "Mostly Oil" Blow-By Retention Cap delivers the perfect combination of function, style, and Subaru enthusiast culture.