Power Steering Fluid Guide: Types, Leaks and Winter Steering Problems

November 9, 2026 · RPS Distributors

Hydraulic power steering systems use fluid under pressure to make steering easy. When the fluid is low, old or the wrong type, drivers notice stiff steering, a whining pump and leaks — and cold weather makes all of these worse.

Types of power steering fluid

Universal power steering fluid — works in many vehicles that call for standard power steering fluid.
Vehicle-specific fluids — some makers, including many European and Asian brands, require a specific fluid.
ATF — some older vehicles use automatic transmission fluid in the power steering system.

Always check the owner's manual or the reservoir cap. Many newer vehicles have electric power steering and no fluid at all.

How to check the level

Find the reservoir, usually marked with a steering wheel symbol.
Check the level against the "hot" or "cold" mark, depending on engine temperature.
Top off with the correct fluid if needed. Do not overfill.

Warning signs

Whining or groaning when turning, especially when cold
Stiff or jerky steering
Fluid drips near the front of the vehicle
Foamy or dark fluid in the reservoir

Do stop leak products help?

Power steering stop leak products condition seals and can slow small seepage from aging seals. They will not fix a cracked hose, a damaged line or a failed pump. See our stop leak guide.

Frequently asked questions

Why is my steering stiff on cold mornings?
Cold fluid flows slower, and low or old fluid makes it worse. Check the level and condition, and look for leaks.

Can I use ATF in place of power steering fluid?
Only if the manufacturer specifies it. Using the wrong fluid can damage seals.

How often should power steering fluid be changed?
Follow the service schedule. Replace it sooner if it is dark, foamy or smells burnt.