According to German law, here in Germany only PAO / Group IV+V is allowed to be labeled "Fully Synthetic" Shell is labeld "Synthetic technolgy" here, Mobil 1 "SHC technology" and Motul, the Company that tried to cheat Customers and lost on Court, (HOW Stupid are they??) is now newly labbeld "Synthese Technology" here. All theses Oils are Group III, Hydrocracked or a mix of Group IV + III The only true fully synthetic oils available here i am aware of are from Ravenol, Liqui Moly and Rowe. Group I is mineral, Dino. Groupi II is semi-synth. A mix of I and III/IV, Group III is Hycrocracked or GTL, so called Synthetic, Group IV is the real deal, fully synthetic PAO / Ester. FYI: Motul was so stupid and printed "Fully Synthetic" on the bottles here in Germany, but were sued by annother company for wrong advertising and lost on court, now all bottles are newly labeld here in germany.