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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 main difference between crude oil and shale oil is that crude oil naturally exists in a liquid state whereas shale oil naturally exists in a solid state.The Figure 1. illustrates the classification of the earthâs organic sediments according to its physical state, hydrocarbon occurrence, and production.