Service Intervals

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Change the ATF and filter every 50,000 miles if the vehicle is mainly driven under one or more of these conditions:

In heavy traffic where the outside temperature regularly reaches 90°F (32°C) or higher.
In hilly or mountainous terrain.
When doing frequent towing
Uses such as found in taxi, police or delivery service.

If the vehicle is not used under any of these conditions, change the fluid and filter every 100,000 miles.