1998 Pontiac Bonneville Owner's Manual - Page 271

How to Check and Add Oil Check oil only when engine is cold. Allow the the engine to cool two to three hours after running. Automatic Transaxle Fluid When to Check and Change A good time to check your automatic transaxle fluid level iswhen the engine oil is changed. Change both the fluid and every 50,000 miles filter (83 000 km) if the vehicleis mainly driven underone or more of these conditions: 0 If you remove the supercharger €ill plug while oil the engineis hot, pressure may cause hot to oil blow outof the oil fill hole. You may be burned. Do not remove the plug until the engine cools. 1. Clean the area around the fill plug before oil removing it. 2. Remove the oil fill plug using a 3/16 inch Allen wrench. 3. The oil level is correct whenjust reaches the it bottom of the threadsof the inspection hole. 4. Replace the oil plug with theO-ring in place. Torque to 88 lb-in (10 N-m). 0 In heavy city traflic where the outside temperature regularly reaches 90°F (32°C) or higher. In hilly or mountainous terrain. When doing frequent trailer towing. Uses such as found in taxi, police delivery service. or If you do not use your vehicle under anythese of conditions, the fluid and do not require changing. filter See "Scheduled Maintenance Services" the Index. in How to Check Because this operation can be a little difficult, you may this choose to have done at your Pontiac dealership Service Department. If you do it yourself, be sure to follow allthe instructions here, or you could geta false reading on the dipstick. 6-20