1998 Buick Century Owner's Manual - Page 277

Automatic Transaxle Fluid When to Check and Change A good time to check your automatic transaxle fluid level is when the engine oilis changed. Change both the fluidand filter every 50,000 miles (83 000 k ) the vehicle is mainly driven under one or m if more of these conditions: 0 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 the all instructions here, or you could get a false reading on the dipstick. In heavy city traffic where the outside temperature regularly reaches 90 O F (32 O C) or higher. In hilly or mountainous terrain. When doing frequent trailer towing. Uses such as found in taxi, police or delivery service. I NOTICE: 0 If you do not use your vehicle under any of these conditions, the fluid filter do not require changing. and See "Scheduled Maintenance Services" in the Index. Too much or too little fluid can damage your transaxle. Too much can mean that some the of fluid could come out and fall hot engine parts on or exhaust system parts, starting a fire. Be sure to get an accurate reading you check your if transaxle fluid. Wait at least 30 minutes before checking the transaxle fluid levelif you have been driving: When outside temperatures are above 90°F (32"C ) . 0 At high speed for quite a while. 6-17