Aside from some standard chrome trim on the door handles and roof rails, changes to the 2006 Buick Rainier focused on safety and fuel economy. New in 2006 is the Stabilitrak traction and antiskid system. Also new is Active Fuel Management in the V8, which basically shuts down 4 of its 8 cylinders at highway cruising speeds in order to reduce gas consumption.

The truck-based Rainier SUV comes in only one CXL trim that is offered with rear-wheel or all-wheel drive. A 4.2-liter, 191-hp V6 is standard, but for more grunt and towing capacity, you can upgrade to a 5.3-liter, 302-hp V8. Both engines come only with a 4-speed automatic transmission. Though sharing a platform and look with the Envoy and Trailblazer, the 2006 Rainier is available only with 2 rows of seats. There is no extended cab. The rear seats do fold 60/40 to expand a nice-sized cargo hold. ABS brakes, leather seats, OnStar and dual-zone climate control are just a few of the standard features. Heated seats, a navigation system and a DVD player can be added.

Most owners are surprised, but very pleased with how many standard features come with the 2006 Rainier. It has a lot of room, and the overall ride is very smooth and quiet, considering this is a truck-based SUV. The V8's hauling power gets high ratings. Some have had numerous repair problems already with the Rainier, but the biggest complaints seem to be a need for an updated transmission and the option of 3 rows of seating.