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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.
Synthetic oil is used as a substitute for lubricant refined from petroleum when operating in extremes of temperature, because, in general, it provides superior mechanical and chemical properties to those found in traditional mineral oils.emi-synthetic oils (also called 'synthetic blends') are blends of mineral oil with no more than 30% synthetic oil designed to have many of the benefits of synthetic oil without matching the cost of pure synthetic oil. Motul introduced the first semi-synthetic motor oil in 1966.