The main ingredient in the vast majority of automotive antifreeze on the market today is ethylene glycol. Virgin ethylene glycol is produced from ethylene which is produced in the petrochemical industry by steam cracking.  Steam cracking is a process that reduces complex hydrocarbons into simpler hydrocarbons, and is used to produce the many products that come from crude oil and other complex hydrocarbons. (Jet fuel, gasoline, diesel fuel, motor oil, ethylene and propylene glycol, etc.)