What does synthetic oil do for my car that regular oil does not?
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There is no “regular” motor oil on the market today with the exception of specialty oils used in very specific applications. Oil cannot meet current API specs (SP) without at least being a synthetic blend. It is double tough as wear/friction requirements have improved, but additives (zinc/moly) have been reduced.
The thing about synthetics is you know what you are getting from a molecular standpoint. With normally refined oils you have a percentage of the distillate that are either too light, or too heavy. Some molecules just unravel, or they polymerize. This throws off your Noack volatility numbers, and skews the viscosity. You can blend a non synthetic oil that meets standards out of the bottle, but it doesn’t stay in spec very long. I think it has been 10 or 12 years since there have been actual 100% dino oils.
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