The following are both gasoline and diesel motor oils and are typically sold as motor oil. Carquest Fleet Motor Oil, Castrol Heavy Duty, Valvoline All Fleet, (Chevron) Delo 400 Heavy Duty, and Napa Universal Fleet, to name a few.
All have the following features: "Are ideal for naturally aspirated and supercharged diesels. For use in high output gasoline and diesel engines. Exceeds the manufacturers' specifications; Cummins, Mack EO-M, Detroit Diesel (4 stroke), Caterpillar, Navistar, Allison C-4, and Caterpillar CD/TO-2." Prices vary from $1.65 to $2.95 a qt.