A gallon of oil’s weight mostly depends on the type of oil. The temperature at which the oil is kept might also affect the precise weight. The majority of popular oils weigh between 7 and 8 pounds, while the average gallon of stored crude oil weighs about 7.2 pounds.
While crude oil weighs about 7.2 pounds per gallon and olive oil weighs about 7.6 pounds per gallon, recycled motor oil weighs 7 pounds per gallon. Glycerin, for example, can weigh up to 10.5 pounds per gallon in heavy oils.
The viscosity and density of liquids are influenced by temperature, which is why the weights of oils frequently change. As the temperature rises, most oils lose density and become more viscous.