Dexron II is a transmission fluid specification, not a dedicated power steering fluid. Some older GM systems used Dexron II or Dexron II-D as their power steering fluid, but today you should follow the fluid specification stated in your vehicle’s manual.
Understanding Dexron II and power steering systems
Dexron II (and its variant Dexron II-D) were once common in both transmissions and some power steering units. Modern vehicles often require different specifications or a dedicated power steering fluid. The key is to match the fluid to what the manufacturer recommends for your exact model and year. Always check the owner’s manual, reservoir cap labeling, or GM service bulletins for the correct specification.
What fluids are compatible with Dexron II in power steering systems
The following options cover the typical compatibility scenarios you may encounter. They are intended to guide you when your manual indicates a Dexron II-based specification or when you see Dexron II compatibility noted on PSF products.
- Dexron II ATF, or the Dexron II-D variant, used in power steering systems that explicitly call for Dexron II compatibility.
- Power steering fluids or ATFs labeled as "Dexron II compatible" or "Dexron II/II-D compatible" for vehicles that specify Dexron II in the PS system.
- Older GM PS systems that were designed to use Dexron II ATF may allow switching between Dexron II and Dexron II-D ATFs, provided the manual permits ATF use in the PS reservoir.
When the vehicle manual requires a dedicated Power Steering Fluid (not ATF), use only that PSF and not Dexron II ATF. If the manual is silent or ambiguous, consult a dealership or qualified technician before mixing fluids.
Practical considerations for choosing a compatible fluid
To ensure you select the correct product and avoid damage to seals or aging components, follow these steps before purchasing or topping up.
- Identify the exact specification required by your vehicle (look on the reservoir cap, under the hood, or in the owner's manual).
- If the manual allows Dexron II or Dexron II-D ATF in the power steering system, choose a product explicitly labeled as Dexron II or Dexron II-D compatible.
- If the manual specifies a dedicated Power Steering Fluid (PSF) brand or generic PSF, use that product instead of ATF.
- Do not mix Dexron II with fluids that are not approved for your system; if you’re unsure, flush and replace with the approved PSF or ATF as directed by the manual.
- After refilling, bleed the PS system to remove air and verify that the fluid level remains within the correct range.
In practice, the safest approach is to follow the manufacturer’s specification exactly. Dexron II compatibility is largely a matter of whether your system was designed for Dexron II ATF or for a dedicated PSF, and these requirements vary by model and year.
Summary
Dexron II is an automatic transmission fluid specification, not a universal power steering fluid. It can be compatible in some older GM power steering systems that were designed for Dexron II or Dexron II-D ATF, and some PSFs are marketed as Dexron II-compatible. Always verify with the owner’s manual or a trusted dealer/technician. When in doubt, use the exact PSF specified for your vehicle to avoid potential seal damage and performance issues.