The Pontiac G6 typically uses Dexron-family automatic transmission fluid (ATF) for its hydraulic power steering system. For most 2005–2009 models, Dexron II or Dexron III ATF is specified. Dexron VI is generally compatible with many GM systems, but you should verify the exact specification for your year and engine in your owner's manual or with a GM service bulletin.
Understanding the fluid specification for your G6
GM’s service literature for mid-2000s GM vehicles commonly lists Dexron II or Dexron III ATF as the correct power steering fluid. Dexron VI, introduced later, is backward compatible with many GM hydraulic power steering systems, but exact compatibility can vary by model year and engine. Always confirm the specification for your exact car before refilling or flushing the system.
These are the ATF options most often discussed for the G6’s power steering system:
- Dexron II ATF
- Dexron III ATF
- Dexron VI ATF (generally compatible, but verify with your manual)
Conclusion: Use the ATF type specified for your car’s year/model. Do not mix different ATF types, and if in doubt, consult the owner's manual or a qualified technician to avoid steering-system problems.
Year-by-year and model notes
For the Pontiac G6 produced around 2005–2009, the standard recommendation in most manuals is Dexron II or Dexron III ATF for the power steering system. Dexron VI is commonly compatible, but some cars may have restrictions or preferences based on production year or engine variant. Always check your specific vehicle’s manual or contact a GM dealership for confirmation.
Practical tips for maintenance and checks
Before attempting any maintenance, ensure you have identified the correct specification for your exact vehicle. When checking or refilling the power steering fluid:
- Park on level ground and let the engine cool before opening the reservoir.
- Check the reservoir cap or manual to confirm the appropriate ATF type (DEXRON II/III or as specified).
- Use only the recommended Dexron ATF—do not substitute engine oil or other hydraulic fluids.
- If the level is low, top up with the specified ATF until it reaches the correct fill line; do not overfill.
- Inspect for signs of leaks or fluid contamination (dark, gritty fluid or foaming may indicate a problem).
- If you notice steering noise, stiffness, or difficulty turning, have the PS system inspected by a professional, as these can indicate leaks or pump/gear wear.
Note: If you are flushing or replacing the fluid, it’s often best to use a professional service to ensure the system is drained correctly and refilled with the specified ATF type.
Summary
In short, the Pontiac G6’s power steering system uses Dexron-family ATF. Dexron II or Dexron III ATF is commonly specified for 2005–2009 models, while Dexron VI is generally compatible but verify for your exact year. Always use the recommended fluid, avoid mixing types, and consult the owner’s manual or a dealer if you’re unsure about the correct specification for your vehicle.