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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 requires changing anywhere from 5,000 to 15,000 miles, while drivers generally change traditional oil every 3,000 miles. The length of time between oil changes varies depending on the make and model of cars, along with age and the oil ingredients.