US oil barrels
A US oil barrel, also known as a petroleum barrel, is a volume unit used in the oil and gas industry to measure crude oil or liquid petroleum gas (LPG). One US oil barrel is 42 US gallons or about 159 liters.
Cubic Centimeters
A cubic centimeter (cm³) is the volume of a cube 1 centimeter on each side, and is the same as a milliliter. Engine sizes are quoted in it, so a 1,600cc engine is 1.6 liters.