New or Significantly Altered Models

2004 Buick Rainier
Buick adds a version of the Trailblazer/Envoy called the Rainier. Buick looks for extra quiet ride and a standard 5.3L V-8 to differentiate the Rainier from other offerings.

Updated Models

2004 Buick Rendezvous
An Ultra trim-level appears for the Rendezvous equipped with a 245hp V6.

Mostly Unchanged

2004 Buick Century
2004 Buick LeSabre
2004 Buick Park Avenue
2004 Buick Regal