1997 Buick Regal Owner's Manual - Page 295

Automatic Transaxle Fluid When to Check and Change A good time to check your automatic transaxle fluid level is when the engine oil is changed. Change both the fluid and filter every 50,000 miles (83 000 km) if the vehicle ismainly driven under one or more of these conditions: In heavy city traffic 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 or delivery service. If you do not use your vehicle under of these any conditions, the fluid and filterdo not require changing. See "Scheduled Maintenance Services"in the Index. How to Check Because this operation can be a little difficult, you may choose to have this done at your Buick dealership Service Department. If you do it yourself, be sure to follow all the instructions here, or you could get a false reading on the dipstick. I I NOTICE: I Too much or too little fluid can damage your transaxle. Too much can mean that some the of fluid could come out and fall on hot engine parts or exhaust system parts, starting a fire. Be sure to get an accurate reading if you check your transaxle fluid. 6-19