Diesel engines are making a serious comeback in light-duty trucks. Although diesel-powered cars have been pushed aside for now as manufacturers concentrate on hybrids and electric vehicles, the availability of full-size diesel-powered pickups like the 2020 GMC Sierra 1500 is rapidly on the rise.
Traditionally, diesel power has been limited to the largest heavy-duty versions of America’s pickups — rigs designed for extreme towing and job-site duty. The more popular half-ton or light-duty trucks from Chevrolet, GMC, Ford, and Ram were once powered exclusively by gasoline-burning engines. But that’s not the case anymore. For 2020, all four manufacturers are offering their half-ton trucks with six-cylinder diesel engines. Our test truck, a diesel-powered 2020 GMC Sierra 1500 4WD Crew AT4, competes with diesel versions of the Ford F-150, Chevrolet Silverado, and Ram 1500. After time behind the wheel, both on the road and off, it’s clear this is one the best half-ton Sierras that GMC has ever offered.