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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.
One of the common misconceptions about these two types of engine oils is that oneâsyntheticâmust last longer than the other. In fact, both synthetic oil and regular engine oil last the same interval, but there are several other important differences between synthetic oil and conventional oil.