Yes, but only if your vehicle’s manufacturer explicitly allows ATF+4 for the power steering fluid. If the manual doesn’t approve ATF+4 for PS, use the fluid it calls for.
ATF+4 is a Chrysler/Fiat automatic transmission fluid specification (MS-9602) that some FCA Group vehicles use beyond transmissions. Certain power steering systems in FCA models are designed to run on ATF+4, while many other brands and models require a dedicated power steering fluid or a different ATF specification such as Dexron or Mercon. Using the wrong fluid can cause noise, stiff steering, seals damage, or leaks, so always verify compatibility with the official manual or dealer guidance before making a change.
How to determine compatibility
Before consulting the list below, check the manual, reservoir cap, and any service bulletins to confirm whether ATF+4 is approved for the power steering system.
- The owner’s manual explicitly lists ATF+4 as an approved power steering fluid.
- The power steering reservoir cap or label states ATF+4 or “ATF+4 approved” for the system.
- The vehicle is a Fiat-Chrysler (FCA) group model where ATF+4 has historically been used in PS for certain years or configurations.
- The manufacturer warns against substituting with Dexron III/Mercon or other fluids due to seal compatibility or performance concerns.
Consulting the manual or a dealer is essential; if there is any uncertainty, do not risk using ATF+4 in the power steering system.
What to do if your manual allows ATF+4 for PS
If ATF+4 is approved for the PS on your vehicle, you can proceed with confidence, but still follow best practices for maintenance and bleeding. The steps below outline general guidance; always follow the exact service procedure recommended for your car.
- Ensure the engine is off and the reservoir cap is clean to avoid contamination.
- Remove old power steering fluid until the reservoir is near empty, using a clean syringe or turkey baster.
- Fill with ATF+4 to the correct level as indicated on the dipstick or the “full cold” line.
- With the engine running, gently turn the steering wheel from lock to lock several times to circulate the new fluid and purge air.
- Check the level again and top off if necessary; inspect for leaks around the pump, hoses, and rack.
Follow any model-specific bleed procedures if provided in the manual, as some systems require a dedicated bleed sequence.
Alternatives and caveats
If your vehicle’s manual specifies a different power steering fluid, do not substitute ATF+4. Some systems use a dedicated PS fluid (often labeled as power-steering fluid) with particular formulations. Incompatibility can damage seals, reduce lubrication, and lead to noise or failure.
Summary of key takeaways
Bottom line: ATF+4 is not a universal substitute for power steering fluid. It can be used in PS only when the manufacturer explicitly approves it for your model and year. Always verify the official specification and follow the recommended service procedures. When in doubt, consult your owner’s manual or a trusted dealer.
Summary
To avoid damage or unintended consequences, treat ATF+4 as vehicle-specific. If your car’s documentation allows ATF+4 in the power steering system, you can use it following proper service steps; otherwise, stick to the recommended PS fluid. Regular checks and correct formulation are essential for steering performance and system longevity.