1998 Buick Park Avenue Owner's Manual - Page 295

Because this operation can be a little difficult, you may choose to have this done set your 3uick dealerslug Service Department. If you do it yourself, be s u e to follow all the instructions here, OT you could get a false reading on the dipstick. Wait at Beast 30 minutes before checking the transaxle fhid lwei if you have been driving: 8 @ When outsiOe temperatures are above 90°F ( m 0 -e>. 3 ~ At high speed for quite a while. While gulling a trailer. e In heavy traffic -- especiaily in hot weather. 8