Like every GMC vehicle, the 2015 Sierra All Terrain HD comes with two years of scheduled maintenance, which includes
diesel exhaust fluid refills, a three - year / 36, 000 mile bumper - to - bumper warranty and a five - year / 100, 000 mile powertrain warranty.
Choosing this engine means having to mind your urea: in solution as
diesel exhaust fluid, it reduces the turbodiesel's emissions, but the storage tank must be
refilled every 4000 miles; the only bigger nuisance would be having a cow to milk twice a day.
* Horsepower and torque expected to top previous model (testing is ongoing — check media.gm.com for updates) * NOx emissions reduced at least 63 percent over 2010 models * Quieter operation * High - pressure (30,000 psi / 2, 000 bar) Piezo - actuated fuel system for greater fuel efficiency, improved performance and reduced emissions *
Exhaust brake system that enables controlled vehicle slowdown on downhill grades without actuating the brakes * Selective catalytic reduction after - treatment system using diesel exhaust fluid (DEF) injection to provide the best overall diesel characteristics and performance — with a range of about 5,000 miles (8,000 km) between DEF refills * Combustion and after - treatment have been optimized to provide about 700 miles (1,125 km) between diesel particulate filter regenerations — a 75 - percent improvement over the previous system and significant contributor to improved fuel efficiency, as the regeneration process requires additional fuel * B20 biodiesel capability for an alternative fueling option * Internal revisions that improve dur
Exhaust brake system that enables controlled vehicle slowdown on downhill grades without actuating the brakes * Selective catalytic reduction after - treatment system using
diesel exhaust fluid (DEF) injection to provide the best overall diesel characteristics and performance — with a range of about 5,000 miles (8,000 km) between DEF refills * Combustion and after - treatment have been optimized to provide about 700 miles (1,125 km) between diesel particulate filter regenerations — a 75 - percent improvement over the previous system and significant contributor to improved fuel efficiency, as the regeneration process requires additional fuel * B20 biodiesel capability for an alternative fueling option * Internal revisions that improve dur
exhaust fluid (DEF) injection to provide the best overall
diesel characteristics and performance — with a range of about 5,000 miles (8,000 km) between DEF
refills * Combustion and after - treatment have been optimized to provide about 700 miles (1,125 km) between
diesel particulate filter regenerations — a 75 - percent improvement over the previous system and significant contributor to improved fuel efficiency, as the regeneration process requires additional fuel * B20 biodiesel capability for an alternative fueling option * Internal revisions that improve durability