In 1996, GMC sold three vehicles bearing the "2500" classification: Sierra, Suburban and Savana. All three models had a 6.5-liter V-8 diesel engine that produced between 180 and 190 horsepower as an available option. Knowing the oil capacity of this engine helps greatly when planning maintenance, as it prevents guesswork and allows you to buy only the amount of oil you need.
The oil capacity of the 6.5-liter diesel engine in all of the GMC 2500 vehicles is 7 quarts, which includes refilling the oil filter.
