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
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