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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.
Conventional oil is ideal for frequent oil changes or cars with low mileage engines. Premium Conventional Oil: The most common type of motor oil. 5W-20, 5W-30 and 10W-30 are common viscosity ratings and cover most types of light duty vehicles.