Those familiar with GM models may assume that a three-year/36,000-mile powertrain warranty is standard fare on every branch of the family tree. However, there are a few exceptions, and the 2006 Buick Lucerne is one of them. Like all 2006 Buicks, the Lucerne is backed by four-year/50,000-mile basic and powertrain warranties and six years or 100,000 miles of corrosion protection.