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Best Answer: Gallon is a unit of volume, Kg is a unit of weight (mass). Considering a liter weighing 1 Kg (water for instance), then a gallon weighs 3.7854118 Kg. To expand upon Robert's answer... A kilogram is a mass; a gallon is a volume - to convert between the two you need to know the density of the liquid. Then, you can take 1 gallon, multiply by density (make sure it's in the form kg/gallon - you may need to do some conversions) and you'll get mass. anonymous Â· 9 years ago.
Weight of Oil One gallon of oil is 6-8 pounds depending on density. If you assume SAE 10W-30 oil; density is 875 grasm/litre = 1.929 pounds per litre = 7.3 pounds per US gallon. Assume SAE 10W-30 oil; density is 875 grasm/litre = 1.929 pounds per litre = 7.3 pounds per US gallon. Cheers Malcolm.