New or Significantly Altered Models
- 2005 Buick LaCrosse
- New midsize replaces both the Regal and Century. Related to the Grand Prix, Buick paid significant attention on noise isolation. Two engines are available. A 200hp V6 and a 240 all-aluminum V6 with variable valve timing.
- 2005 Buick Terraza
- New Terraza adds a third utility vehicle to Buick's lineup. Terrazza is a mid-sized van with SUV styling traits to broaden it's appeal. A 200 hp 3500 V6 provides power. Both FWD and AWD models are offered.
Mostly Unchanged
- 2005 Buick Century
- Special Edition package is offered commemorating the final model year for the Century.
- 2005 Buick LeSabre
- Standard OnStar. Three new exterior colors.
- 2005 Buick Park Avenue
- The fender portholes are standard on all Park Avenues. This is the final model year for the Park Avenue. Buick will introduce a new premium sedan in Fall of 2005. The final 3000 models will be badged as Special Edition.
- 2005 Buick Rainier
- The 290hp Vortec 5300 is now available on RWD and AWD models. Minor interior trim piece upgrades.
- 2005 Buick Rendezvous
- The 240hp Ultra package is now available with FWD. In addition, the 3.6L VVT engine is now available in the FWD CXL model.
Discontinued
- 2004 Buick Regal
