Subarus with hydraulic power steering typically use standard automatic transmission fluid (ATF) such as Dexron II or Dexron III, with Dexron VI acceptable on many newer models. Vehicles with electric power steering (EPS) do not require a dedicated power steering fluid at all. The exact specification depends on your model year and trim, so always check the owner's manual and the reservoir label for the correct fluid.
Hydraulic vs Electric Power Steering in Subarus
Many older Subaru models rely on hydraulic power steering that uses ATF in a dedicated reservoir. In the 2010s, Subaru shifted several models to electric power steering, which eliminates the need for a steering fluid fill. Understanding which system your car has is essential to using the right fluid or knowing when a fluid change isn’t applicable.
To help guide owners, here are the typical fluid scenarios you may encounter, depending on generation and model:
- Dexron II or Dexron III automatic transmission fluid (ATF) is the traditional specification for hydraulic power steering in many Subarus built before the mid-2010s.
- Dexron VI ATF is commonly compatible and accepted in newer Subarus with hydraulic power steering, but you should verify against your owner's manual since some models have specific requirements.
- Subaru Power Steering Fluid (a branded PSF) has appeared in some older manuals as an approved option for certain generations; never mix with engine oil or other fluids unless the manual explicitly allows it.
- Electric power steering (EPS) systems, which appear on many models from the mid-2010s onward, do not use a power steering fluid reservoir and require no PS fluid.
In short, you don’t need a uniquely branded Subaru PS fluid for most models, but you do need to follow the exact specification listed for your car. If your vehicle uses EPS, there’s no PS fluid to purchase or replace.
Determining which fluid your Subaru uses
To determine the correct power steering fluid for your vehicle, follow these steps:
- Check the owner's manual for the exact specification (ATF Dexron II/III, Dexron VI, or any brand-specific PSF) and notes about whether the system is hydraulic or electric.
- Inspect the power steering reservoir label on your car; it may indicate the required fluid type or warn against using other fluids.
- Identify your model year and trim to confirm whether the car is equipped with hydraulic PS or EPS, since this often changes over generations.
- When refilling, use only the specified type and avoid mixing different fluids; if you recently mixed fluids, consider draining and refilling according to the manual.
Conclusion: Following the manual ensures you use the correct fluid and maintains steering performance and reliability. If you’re unsure, contact a Subaru dealer or a trusted mechanic for confirmation.
Maintenance tips and common pitfalls
Tips: If you notice whining, stiffness, or a drop in steering performance, check for fluid level and leaks in hydraulic systems, or software-related updates for EPS systems. Do not top off with the wrong type of fluid, and have ambiguous situations checked by a professional to avoid damage to hoses, seals, or steering components.
Summary
Subarus do not require a single, universal “special” steering fluid across all models. For hydraulic power steering, ATF in the Dexron II/III family is commonly specified, with Dexron VI becoming more common in newer generations. For most modern Subarus with EPS, no steering fluid is required. Always verify with the owner’s manual for your exact year and trim, and consult a dealership or qualified technician if you’re changing fluids or diagnosing steering issues.