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The question has been asked as to why Green Earth chose animal fat as a starting material rather than a vegetable oil. The answer is that once the fat has been processed to make the G-OIL biological base material, there is a resulting mixture of fatty acids rich in heavy materials with a longer carbon chain length, which lack the oxidation and temperature sensitive double bonds found in plant oils. The G-OIL biological base material mimics the composition of petroleum oils, which are distillations rich in aliphatic, and linear vs. ring or compound structure in the 16 , 18 and 20 carbon chain lengths with no double bonds between the carbons. Grape seed oil contains little or no 20 carbon length material, so either more additives or more Grape Seed material would be needed to obtain the desired viscosity.