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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 vs. Conventional. Although you might know that synthetic oils outperform conventional oils, you might not understand why. The differences begin at the molecular level. Synthetics donât contain the impurities and molecular irregularities inherent to conventional oils.6% easier and faster cold starts. When the temperature drops, motor oils thicken and move slower, causing parts of your engine to remain unprotected for a short period of time. AMSOIL is more fluid at cold temperatures than the tested conventional oil, giving you 36% easier and faster cold starts*.