Base oils impart basic specific properties to the lubricant which are reflected in the performance of the finished products. Mineral oils: Hydrocarbon compounds of different shape, structure, type and size (VI: 80-95) Hydrocracked oils: Refined mineral oils with a higher purity level and an improved molecular structure (VI: 130-140) Polyalphaolefins (PAOs): Petrochemical synthesis products – chemically synthesized straight-line hydrocarbon compounds (VI: 130-145) Synthetic esters: Chemically synthesized compounds of organic acids and alcohols consisting of molecules of a defined shape, structure, type and size. (VI: 140-180)