Parts for your 2010 Subaru Impreza-Power steering fluid

2010 Subaru Impreza Power Steering Fluid — What It Uses and How to Look After It

Power-steering fluid is absolutely relevant on the 2010 Subaru Impreza. This model runs a hydraulic power steering system (not electric), and the factory documentation confirms it. The 2010 Subaru Impreza Owner’s Manual and the Subaru service manual for the GE/GH/GR platform specify automatic transmission fluid as the correct power-steering fluid — specifically ATF meeting Dexron III or Subaru ATF/ATF-HP — rather than a generic “power steering fluid”.

In this setup, the fluid’s job is to transmit hydraulic pressure from the pump to the steering rack, making low-speed manoeuvres light and predictable while maintaining good road feel at speed. Fresh, correct-spec fluid helps reduce pump whine, protects seals inside the rack, and keeps assistance consistent on hot summer days and chilly South Island mornings alike.

While Subaru doesn’t publish a strict replacement interval for this model, regular inspection is part of sensible servicing. Many workshops in Australia and New Zealand recommend a preventative fluid exchange around every 80,000–100,000 km or five years, especially if the fluid is dark, smells burnt, or the steering has grown a bit noisy. The Impreza’s reservoir has hot/cold level marks — levels should be checked with the car on level ground and the engine at the corresponding temperature mark.

• Only use ATF that meets Dexron III or Subaru ATF/ATF-HP. Avoid mixing with “universal” power steering fluids.
• If there’s a whine on cold start or when turning, inspect the pump inlet O-ring (a known air-ingress culprit) and hose clamps on the return line.
• For bleeding after a fluid change: with the front wheels off the ground, turn lock-to-lock slowly a few times with the engine off, top up, then repeat with the engine idling until bubbles clear.
• Watch for leaks at the rack boots, pump body, and hose crimps, reddish fluid under the car is a giveaway.

A simple “turkey baster” top-up exchange at each service can freshen the system gradually, but a proper return-line flush gives the best result when the fluid is tired. Treated well, the Impreza’s hydraulic steering stays quiet, light, and dependable for the long haul.

Popular questions

What fluid does a 2010 Subaru Impreza use for the power steering?
The 2010 Impreza uses automatic transmission fluid, not a generic power-steering fluid. Subaru specifies ATF that meets Dexron III or Subaru ATF/ATF-HP. Sticking to this spec helps avoid pump noise, aeration, and seal issues.

How often should the power-steering fluid be changed?
Subaru lists inspection rather than a hard interval, but many local workshops suggest replacing it about every 80,000–100,000 km or five years. If the fluid looks dark, smells burnt, or the steering is noisy, bring it forward.

What are signs the fluid needs attention?
Common signs include a whining or groaning noise when turning, heavy steering at low speeds, bubbles or foam in the reservoir, and fluid that’s gone brown/black. Any dampness around hoses, the pump, or rack boots points to a leak that needs sorting.