Oils such as Mobile 1 and AMSOIL are true synthetic oils and are chemicly created from "scratch" not processed dino oil. Others such as Castrol Syntec are hydroisomerized (processed) petroleum oil.

__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine