2004 Pontiac GTO Owner's Manual - Page 209
2004 Pontiac GTO Manual
Page 209 highlights
Automatic Transmission Fluid {CAUTION: Operating the engine with the air cleaner/filter off can cause you or others to be burned. The air cleaner not only cleans the air, it helps to stop flame if the engine backfires. If it is not there and the engine backfires, you could be burned. Do not drive with it off, and be careful working on the engine with the air cleaner/filter off. Notice: If the air cleaner/filter is off, a backfire can cause a damaging engine fire. And, dirt can easily get into your engine, which will damage it. Always have the air cleaner/filter in place when you are driving. When to Check and Change The fluid level should be checked monthly, by looking at the fluid level on the dipstick. A good time to check your automatic transmission fluid level is when the engine oil is changed. See Scheduled Maintenance on page 6-4 for more information on when to check and change the fluid and filter. 5-19