SKU: 52001-AK131 | UPC: 4957266455913
HKS SUPER BOXER RACING OIL 10W-40 4L for Subaru Impreza WRX STI 2004-2021
HKS Super Boxer Racing Oil 10W-40 4L delivers fully synthetic ester-based lubrication tailored for high-revving Subaru boxer engines. This 4-liter racing oil fits Impreza WRX STI Legacy Forester models with EJ20 EJ25 FB engines offering reliable protection during track sessions. It maintains film strength under extreme heat and load for consistent engine performance.
Key Features
- Ester Synthetic Base: Delivers thermal stability up to 150°C with low evaporation for sustained protection in racing conditions
- Shear Stability: Retains viscosity during high shear rates ensuring reliable lubrication at 8000+ RPM
- Low Friction Formula: Reduces internal drag for power gains and smoother operation in boxer configurations
- Cold Start Performance: Flows quickly at low temperatures while resisting breakdown at high temps
- Anti-Wear Additives: Protects bearings cams pistons from metal-to-metal contact in high-load scenarios
Product Notes
- Intended for competition use in off-road or track environments
- Change oil every 3-5 hours of track time or as per engine builder specs
- Ships as non-hazmat via ground standard carriers
Installation Notes
- Professional installation recommended.
- Drain engine completely warm replace filter before filling to 4L capacity
- Compatible with standard Subaru oil filters no special hardware needed
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2007 | Subaru | Impreza | WRX STI |
| 2008-2014 | Subaru | Impreza | WRX STI |
| 2015-2021 | Subaru | WRX | STI |
| 2005-2009 | Subaru | Legacy | 2.5 GT |
| 2004-2013 | Subaru | Forester | XT |
| 2002-2007 | Subaru | Impreza | WRX |
Why Choose HKS?
- Proven in Japanese motorsports like Super Taikyu endurance racing
- Formulated with real-world track data from Subaru engines
- Precision-engineered additives for boxer engine demands
Frequently Asked Questions
-
Q: Does this fit my 2017 WRX STI EJ257 engine?
A: Yes fully compatible with EJ20 EJ25 boxer engines in WRX STI models providing optimal protection for turbocharged setups -
Q: What base oil type is used?
A: 100% synthetic ester base oil blended with PAO for racing-grade thermal shear resistance -
Q: What is the recommended change interval?
A: Every 3-5 hours track time or 3000 miles street use monitor via oil analysis
Shipping & Handling
- Method: UPS Ground
- Availability: In stock - ships same or next business day
- Packaging: 4L metal canister in protective box 11 x 9 x 7 inches
- Weight: 9 lbs
Engine
This engine parts collection covers oil catch cans, thermostats, thermostat housings, radiator components, coolant accessories, engine covers, fuse box covers, cap covers, throttle bodies, supercharger pulleys, idler pulleys, tensioner pulleys, and engine bay dress-up parts for trucks, SUVs, muscle cars, boosted builds, high-horsepower street cars, and performance vehicles that need better reliability, cooling, airflow, oil control, and under-hood styling. The collection is particularly strong for Dodge Challenger, Charger, Durango, Jeep Grand Cherokee Trackhawk, and Ram TRX platforms running 6.2L Hellcat, 6.4L HEMI, and 5.7L HEMI engines, where oil catch can and cooling upgrades address known OEM weaknesses in the PCV and thermal management systems. Import performance platforms including GM LS-based builds, Chevrolet Camaro, and Corvette applications are also represented through Mishimoto, CSF, and ZPE GripTec product lines. Builders who invest in engine bay organization and reliab...
View Engine Products
HKS
HKS is a Japanese manufacturer of premium performance parts founded in 1973 that has been at the forefront of turbocharged engine development, producing turbochargers, exhaust systems, engine management, intercoolers, and supporting performance components for some of the most iconic Japanese sports cars ever built. The brand's GT and GTIII turbocharger series, Super Sequential Blow Off Valves, and Racing Suction intake kits are recognized globally as benchmark-quality products that combine Japanese manufacturing precision with decades of motorsport development experience. HKS products are particularly well-known in the Toyota Supra, Mitsubishi Evo, Subaru STI, Nissan GT-R, and Honda NSX communities, where the brand's heritage in building the world's fastest versions of these cars has created a loyal following among enthusiasts who want the best available components. From a simple racing suction kit to a complete GT turbo with intercooler and ECU tune, HKS provides an end-to-end perf...
View HKS Products
Motor Oil
Discover Our Premium Motor Oil Collection Welcome to our exclusive Motor Oil collection, where quality meets performance. Our carefully curated selection features a variety of high-quality motor oils designed to enhance your vehicle's engine efficiency and longevity. Whether you are a car enthusiast or a casual driver, our motor oils offer superior protection against wear and tear, ensuring your engine runs smoothly under all conditions. Why Choose Our Motor Oil? Superior Protection: Formulated to reduce engine wear and extend the life of your vehicle. High Performance: Designed to perform under extreme temperatures and conditions. Eco-Friendly Options: We offer synthetic and conventional oils that are environmentally conscious. Wide Selection: Choose from a range of viscosities and formulations to match your specific vehicle needs. Shop with Confidence When you shop our Motor Oil collection, you can be confident that you are getting premium products backed by industry stan...
View Motor Oil Products
Oil
Shop oil catch cans, oil separators, air oil separators, oil filters and oil system parts at Black Ops Auto Works for performance cars, daily drivers, diesel trucks, supercharged HEMI builds, Hellcat, Redeye, Demon, Jeep Trackhawk, Ram TRX, LS, LT, Corvette, Camaro, CTS-V, Ford Mustang, Ford F-150, Chevy Silverado, GMC Sierra, Jeeps, trucks, SUVs and high-horsepower engine setups. This Oil collection includes oil catch cans, baffled catch cans, oil separators, air oil separators, oil filters, oil caps, oil pans, oil pumps, oil pickups, dipsticks, drain plugs, oil baffles, oil filter blocks, motor oils and supporting engine oil system components designed for crankcase ventilation, oil control, filtration, serviceability and long-term engine reliability. Shop Oil System Parts by Category Find oil system parts and related engine upgrades across the Black Ops Auto Works catalog. Shop related collections for oil catch cans, engine parts, engine block parts, air intake systems, cold air i...
View Oil Products


