[auspiv]

"Synthetic oil is a lubricant consisting of chemical compounds that are artificially modified or synthesised. Synthetic lubricants can be manufactured using chemically modified petroleum components rather than whole crude oil, but can also be synthesized from other raw materials. The base material, however, is still overwhelmingly crude oil that is distilled and then modified physically and chemically. The actual synthesis process and composition of additives is generally a commercial trade secret and will vary among producers."

https://en.wikipedia.org/wiki/Synthetic_oil

[pfdietz]

Polyalphaolefins (PAOs), the most common synthetic oil, are produced from ethylene. In the US, this overwhelmingly means being produced from natural gas, as US fracked gas is rich in ethane, the feedstock for ethylene production.

https://www.cpchem.com/what-we-do/solutions/polyalphaolefins...