The fluid depends on the transmission: automatics use Subaru ATF WS, CVTs use Subaru CVTF, and manuals use GL-4 gear oil.
For context, the Subaru Impreza has been offered with several different transmissions over its generations, including 4EAT/5AT automatics, and Lineartronic CVTs, as well as 5- and 6-speed manual gearboxes. The exact specification your car needs depends on the transmission type and year. This guide outlines the typical fluids by transmission type and how to verify which one applies to your vehicle.
Identify your Impreza's transmission type
Before selecting a fluid, confirm which transmission your car uses. The following approaches help determine the correct fluid specification:
- Check the owner's manual for the recommended fluid specification and service interval.
- Inspect the vehicle’s transmission code or the sticker under the hood that sometimes lists the fluid type.
- Check the VIN and model year with a Subaru dealer or official service site to confirm the transmission type and required fluid.
Once you know the transmission type, follow the respective fluid guidance below to ensure proper operation and avoid damage.
Fluid by transmission type
Automatic transmissions (4EAT/5AT) in older to mid-generation Imprezas
Most of Subaru's automatic transmissions in the Impreza line use Subaru ATF WS (Automatic Transmission Fluid, World Standard). This fluid is formulated to meet Subaru's hydraulic and friction requirements for their automatics and is the standard recommendation from Subaru service literature for modern automatics. If your manual specifically lists ATF WS, use that; do not mix with other types unless explicitly approved by Subaru. Include in this section: if your car is older and your manual indicates Dexron compatibility, you may see Dexron II/III recommended in some older literature, but the current guidance is ATF WS for most 4EAT/5AT units.
Note: Some older Impreza models (pre-2009) may have service literature that references Dexron II/III; if in doubt, check your service bulletin or consult the dealer. The safest approach is to use Subaru ATF WS for automatics that require it and to avoid generic Dexron fluids unless explicitly approved for your specific unit.
Continuously Variable Transmission (CVT) — Lineartronic
Subaru's CVT-enabled Imprezas use a dedicated CVT fluid. The recommended fluid is Subaru CVTF (CVT Fluid) that meets the manufacturer's spec for Lineartronic transmissions. Do not use standard ATF or other CVT fluids not specified by Subaru, as using an incompatible fluid can degrade performance or damage the transmission. Subaru periodically updates CVTF formulations; always confirm the exact CVTF specification for your VIN.
In some model years, the CVT fluid may be labeled as "CVTF" or "CVTF-FE" depending on revision; the key is to use the Subaru CVTF and follow the service intervals in the owner's manual. If performing a drain and fill, ensure the system is filled to the correct level using the dipstick or fill plug method specified for CVTs.
Manual transmissions (5MT/6MT)
Manual-transmission Imprezas use gear oil rather than ATF. Subaru generally specifies GL-4 gear oil with a viscosity of 75W-90 (some markets use 80W-90). Do not use GL-5 gear oil in manual transmissions, as the friction modifiers can hamper synchronized gear engagement. Check the owner's manual for the exact spec and fill level, and consider swapping the gear oil roughly every 30,000 to 60,000 miles depending on driving conditions.
What to do if you’re unsure
If you’re uncertain about the exact fluid for your Impreza, use official Subaru resources. Provide your VIN and model year to a Subaru dealer or use Subaru’s customer support site to pull the correct fluid specification for your car. This approach ensures you don’t misapply fluids, which can cause transmission damage or void warranties.
Summary
Transmission fluid for a Subaru Impreza depends on the transmission type: automatics use Subaru ATF WS, CVTs use Subaru CVTF, and manuals use GL-4 gear oil. Always verify with the owner’s manual or a Subaru dealer to confirm the exact specification for your year and model, as fluids can differ across generations. Regular maintenance with the correct fluid helps preserve shifting quality and transmission longevity.
Endnotes
Sources: Subaru official service literature and owner manuals, and automotive service guides. For precise guidance, consult your vehicle's manual or a Subaru-authorized technician.
Does Subaru use special transmission fluid?
CVTs require specific fluids designed for their unique operating characteristics. Using the wrong fluid can cause severe damage to your transmission. Always use Subaru-approved CVT fluid or a compatible high-quality alternative like ENEOS ECO CVTF or ENEOS Import CVTF Model S.
What kind of ATF does Subaru use?
The ATF-HP PS Fluid – Subaru (SOA427V1500) is a genuine OEM fluid specifically formulated for Subaru automatic transmissions and power steering systems.
What transmission oil for Subaru?
Subaru Auto Transmission oil
There are three kinds of Subaru auto transmission fluid in use currently. One is the Dextron 3 mineral oil used in the 4AT. With the introduction of the 5AT Subaru went to the Transmax X which is premium automatic transmission fluid specifically designed for use in 5AT Subaru vehicles.
Can low transmission fluid cause stuttering?
If shuddering occurs primarily between 30-45 mph, this suggests torque converter problems related to low fluid levels. This specific speed range often reveals transmission issues that might not be noticeable at other speeds.