Chevrolet 2009 Impala Owner's Manual page 290

What to Add
Use only new DOT 3 brake fluid from a sealed container.
See Recommended Fluids and Lubricants on page 6-12.
Always clean the brake fluid reservoir cap and the area
around the cap before removing it. This helps keep dirt
from entering the reservoir.
CAUTION:
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With the wrong kind of fluid in the brake hydraulic
system, the brakes might not work well. This could
cause a crash. Always use the proper brake fluid.
5-38
Notice:
•
Using the wrong fluid can badly damage brake
hydraulic system parts. For example, just a
few drops of mineral-based oil, such as engine
oil, in the brake hydraulic system can damage
brake hydraulic system parts so badly that they
will have to be replaced. Do not let someone
put in the wrong kind of fluid.
•
If brake fluid is spilled on the vehicle's painted
surfaces, the paint finish can be damaged. Be
careful not to spill brake fluid on the vehicle.
If you do, wash it off immediately. See Washing
Your Vehicle on page 5-92.