Originating in the 1990s, a more refined grade of petroleum Group III base oil, produced by Hydrotreating. Group II+ base oils have a high viscosity index at the higher end of the API Group II range. The viscosity index is 110-115 minimum.
Originating in the 1990s, a more refined grade of petroleum Group III base oil, produced by Hydrotreating. Group II+ base oils have a high viscosity index at the higher end of the API Group II range. The viscosity index is 110-115 minimum.
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