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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.
There are three main three main categories of consumer motor oil. There are conventional petroleum-based oils, and there are synthetic versions created from chemicals. A third category includes products called part synthetic, which combine conventional mineral oil with man-made chemicals. Conventional motor oil is based on crude oil that goes through extensive refining to make it suitable for engine use. Synthetic oil, however, is created through chemical reactions. And like so many other technological advances, synthetics were born in a time of conflict.