The bj can be used on automobiles, trucks, boats, suv's and vans. Diesel and gasoline. One set this device contain a bj and a bottle of liquor. It is called the partner. The bj is installed on fuel supply line and the partner is poured into fuel tank directly. Hereunder are some advantages: Increase mileage up to 26% No tools needed Simply snaps over the fuel supply line and pour into fuel tank Reduces fuel consumption Use for engines diesel and gasoline Use for automobiles, trucks, boats Use for engines up to 16 cylinders Use for fuel line up to 2.5cm Quantity for gasoline engine: 2.5 l 2 set >7.0 l 3 set Quantity for diesel enginee: