General Motors has upgraded warranty coverage on 2006 Buick and Hummer models.
The improvements bring the brands' factory warranties in line with those offered by premium and luxury makes.
Buick and Hummer provide bumper-to-bumper and powertrain coverage on 2006 models for four years or 50,000 miles, whichever comes first.
Among other domestic GM brands, only Cadillac offers the same coverage.
The two brands previously offered the same warranty coverage as Chevrolet, GMC, Pontiac and Saturn. That includes bumper-to-bumper and powertrain coverage for three years or 36,000 miles.
"This is something the dealer council had been asking for," says Conrad Darby, a Buick dealer in Sarasota, Fla. "It's definitely a selling tool."
Aside from Buick, Hummer and Cadillac, 10 other brands provide bumper-to-bumper and powertrain coverage for four years or 50,000 miles. They are Audi, BMW, Jaguar, Land Rover, Lincoln, Mazda, Mercedes-Benz, Porsche, Saab and Volvo.
Three other automakers - Hyundai, Kia and Mitsubishi - offer bumper-to-bumper coverage of five years or 60,000 miles, and powertrain coverage of 10 years or 100,000 miles. Another 10 brands offer broader powertrain coverage than the upgraded GM warranties.
Toyota and Honda provide bumper-to-bumper coverage for three years or 36,000 miles.
Darby says the warranty improvement reflects improvement in the quality of GM vehicles.
He adds: "I don't think it will be a big expense to GM to match the other (luxury and premium) warranties."