I think you are correct. It is fossil based but most likely has synthetic additives. I know it sure looks and smells different than it did 30 years ago. Back then it was redder and had a sweet smell. That actually changed probably 20 years ago or so. Don"t know if there was any change then as far as additives or not. Truth be told I"m guessing most of the quality fossil based oils we are using today have some sort of synthetic additive. Hytran is expensive but I refuse to substitute it with anything else.
 
(quoted from post at 09:31:17 01/04/14)Truth be told I"m guessing most of the quality fossil based oils we are using today have some sort of synthetic additive.
A number of years ago I was doing some simple research on motor oil, reading some well-sourced documents on additives. At that time, Mobil 1 and Amsoil were the only synthetics on the market and there were no "synthetic blends". At that time, the consensus seemed to be that a quart of quality motor oil was about 55% oil and 45% additives. A lot of the additives were straight nonorganic chemicals but some were synthetic compounds. Of course, the synthetic/nonsynthetic question deals mostly with the 55% part of it.
 

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