What fluid goes in a Subaru transmission?
The fluid you use depends on the transmission type. In short: CVTs require Subaru CVT Fluid (CVTF); traditional automatic transmissions use ATF that matches the model year (often Dexron II/III or Dexron VI); manuals use GL-4 gear oil. Always verify the exact specification in your owner's manual or with a Subaru dealer.
Subaru has used these categories across different generations and markets. Because fluid specifications can vary by year and region, consult the manual for your specific model before filling or changing transmission fluid.
Transmission types and their required fluids
Before selecting fluid, identify which transmission your Subaru uses, then apply the appropriate fluid type listed below.
- CVT (Lineartronic): Use Subaru CVT Fluid (CVTF) that meets Subaru’s specification for your model. Do not substitute with standard ATF unless explicitly approved by Subaru for your year/model.
- Traditional automatic transmissions (e.g., 4EAT/5EAT): Use ATF that matches the specification in your owner’s manual. Many older Subarus call for Dexron II-D/III-H; newer cars may specify Dexron VI or another Dexron-family ATF. If in doubt, Dexron VI is a common modern substitute, but confirm for your year/model.
- Manual transmissions (5MT): Use a GL-4 gear oil, typically 75W-90 (synthetic recommended). Do not use ATF or GL-5 gear oil unless the manual specifies it.
Using the correct transmission fluid is essential for proper shifting, lubrication, and longevity of the transmission. Substituting the wrong fluid can lead to slipping, rough shifts, overheating, or damage that may affect warranty coverage.
How to determine the exact fluid you need
Follow these steps to confirm the correct fluid specification for your Subaru model and year.
- Check the owner’s manual or the vehicle’s service booklet for the exact ATF/CVTF/gear oil specification and any market-specific notes.
- Inspect under the hood or near the transmission for a stamped code or label that indicates the required fluid type.
- When in doubt, contact a Subaru dealership or certified technician with your VIN to confirm the correct specification before purchasing or adding fluid.
Getting the specification right helps ensure reliable operation and preserves warranty coverage where applicable.
Maintenance notes and practical tips
Beyond initial filling, follow these practical guidelines to maintain transmission health and fluid integrity.
- Change intervals for CVTF and ATF can differ from engine oil; always follow Subaru’s recommended service intervals for your model/year.
- Use only fluids that meet Subaru’s specifications or OEM-recommended equivalents; aftermarket fluids should be cross-checked for compatibility.
- If you notice slipping, rough shifts, or metallic grinding, have the fluid condition and level inspected by a professional rather than attempting a DIY top-up with an incorrect specification.
These precautions help protect transmission components, maintain shifting performance, and support long-term reliability.
Summary
In Subaru vehicles, the transmission fluid depends on the transmission type: CVTs use Subaru CVT Fluid (CVTF); traditional automatics require ATF that matches the model/year specification (often Dexron II/III or Dexron VI); manuals require GL-4 gear oil. Always verify the exact specification from the owner’s manual or a Subaru dealer before servicing the transmission to ensure proper operation and longevity.
