Andy laut Deiner Tabelle ist Gruppe III PP max. -25° und VI von 120 bis 140. Das kann aber nicht VHVI sein. Die (inoffizielle) Gruppe III+ (darunter fällt auch GTL-Prozess) paßt viel besser zu den Eigenschaften von VHVI (PP -30°C und KV >140).
Laut Wikipedia zu Grundölen (um Übersetzungsfehler zu vermeiden in englisch):
Group III
Originating in 1993, the best grade of petroleum base oil, since they are fully produced by Hydrocracking, Hydroisomerization, and Hydrotreating,[5] which make these oils purer.
API defines group III as "base stocks contain greater than or equal to 90 percent saturates and less than or equal to 0.03 percent sulfur and have a viscosity index greater than or equal to 120".
This group may be described as Synthetic Technology oils or Hydro-Cracked Synthetic oil. However, some oil companies may call their products under this group as synthetic oil.[6]
Group III+
Originating in 2015, produced by a gas to liquids (GTL) process. Group III+ base oils have a Very High Viscosity Index (VHVI) at the higher end of the API Group III range. The viscosity index is 130-140 minimum.