2004 Pontiac GTO Owner's Manual - Page 212

How to Add Fluid Refer to the Maintenance Schedule to determine what kind of transmission fluid to use. See Recommended Fluids and Lubricants on page 6-13. Add fluid only after checking the transmission fluid while it is hot. A cold check is used only as a reference. If the fluid level is low, add only enough of the proper fluid to bring the level up to the HOT area for a hot check. The level should never read over the HOT mark, so be careful not to add too much. It doesn't take much fluid, generally less than 0.6 pints (0.3 L). Don't overfill. Notice: We recommend you use only fluid labeled DEXRON® -III, because fluid with that label is made especially for your automatic transmission. Damage caused by fluid other than DEXRON® -III is not covered by your new vehicle warranty. • After adding fluid, recheck the fluid level as described under "How to Check." • When the correct fluid level is obtained, push the dipstick back in all the way. Remember to always replace the dipstick and lock the handle down. • If fluid has to be added often, there may be a problem or leak and you should see your vehicle dealer. 5-22