The whole synthetic oil vs. conventional oil seems more complicated than it really needs to be. By and large, many late-model vehicles are using synthetic motor oil, but it’s best to refer to your vehicle’s owner manual.
Synthetic oil is refined, distilled, purified, and broken down into its basic molecules. Synthetic lubricants are manufactured using chemically modified petroleum components rather than whole crude oil, but can also be synthesized from other raw materials.
This process removes more impurities from the crude oil but also enables individual molecules in the oil to be tailored to the demands of modern engines.
Conventional motor oil is standard for many vehicles. Conventional oils are improved with chemical additives to help ensure they meet the requirements of vehicle manufacturers. This includes helping to keep internal engine surfaces clean, protecting against overheating and helping to provide resistance to breakdowns.