In short, use Dexron VI automatic transmission fluid (ATF) as the power steering fluid for a 2008 Chevy Impala. Dexron VI is the recommended GM specification and is generally backward compatible with older Dexron fluids.
Recommended fluid type
GM’s service information for the 2008 Impala’s hydraulic power steering system centers on Dexron VI ATF as the primary choice. Dexron III (or earlier Dexron II) ATF is often listed as compatible, but Dexron VI is preferred for better longevity and availability.
- DEXRON VI ATF is the primary and recommended fluid for the 2008 Impala’s hydraulic power steering system.
- DEXRON III ATF is acceptable as a backup if Dexron VI isn’t available, since Dexron VI is backward compatible with Dexron III in GM applications.
- Avoid using non-ATF fluids, engine oil, or other steering-fluid blends not specified by GM.
In practice, Dexron VI is the best-supported option for this model year. If Dexron VI isn’t accessible, Dexron III can be used as a fallback, but avoid mixing different fluid types and follow GM guidelines.
Checking and replacing the fluid
Maintaining the right level and cleanliness of power steering fluid helps protect the pump, hoses, and steering feel. Here are the typical steps owners and technicians follow.
- Park on level ground with the engine at operating temperature and the steering wheel centered; locate the power steering reservoir under the hood.
- Check the fluid level on the reservoir dipstick or sight line; the fluid should be a clear pink/red color and within the marked range.
- If the level is low, add Dexron VI ATF slowly until it reaches the correct mark; avoid overfilling.
- Inspect the fluid for contamination (dark color, burnt smell) and any signs of leaks in hoses or the pump; contaminated fluid may require a system flush.
- If the fluid is dirty or the steering exhibits noise or stiffness, consider a full flush and surface inspection by a qualified technician.
Regular checks help prevent steering issues and pump damage. If you notice persistent noises, stiffness, or leaking, address them promptly to avoid more expensive repairs.
Is the Impala’s steering hydraulic or electric?
Hydraulic vs. electric power steering in the 2008 Impala
The 2008 Chevrolet Impala uses a hydraulic power steering system, not an electric assist setup. This means fluid type and maintenance are still relevant for this model year, and Dexron VI ATF remains the appropriate fluid to use and monitor.
Where to buy and tips
Dexron VI ATF is widely available at auto parts chains, GM dealerships, and online retailers. When purchasing, confirm the product explicitly lists Dexron VI ATF and avoid fluids marketed for different specifications. If in doubt, consult your owner's manual or ask a qualified mechanic for the correct GM specification for your exact vehicle and production date.
Summary
For a 2008 Chevy Impala with hydraulic power steering, the recommended fluid is Dexron VI ATF. Dexron III ATF can serve as a backup if Dexron VI isn’t available, but Dexron VI is preferred. Regularly check fluid levels, look for contamination, and consider a professional flush if the system shows signs of wear. Always refer to the owner's manual for the exact specification and service intervals.