Does anyone know if VIIs for dino are designed differently than those for synthetics? It would seem that the hydrocracked Grp III and PAO-based synthetics would require a different VII simply because of their low polarity and tightly controlled molecular weights. If these Grp III and IV base stocks require different VIIs....then what types are used? Are these inherently better additives (shear stable)? Do they bring increased solvency for the other additives? I am just curious about the different methods for formulating a synthetic vs. dino lubricant!!