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The viscosity index of synthetic base oils is higher than that of conventional petroleum base oils. Pure, Uniform Molecules Form Strong, Stable Lubricants. Petroleum oils have molecular structures that are randomly organized and, consequently, have limited performance abilities.
The chemical composition of conventional motor oil can vary substantially and depends on the. raw crude oil reï¬ ning process. While petroleum base oils are reï¬ ned, synthetic base oils are manufactured and can achieve a higher performance level.