Generally speaking, oils today regardless if they are conventional, synthetic blend, or full synthetic, are more similar than they are different. For the last 5 years or so, many to most "conventional" oils have actually been synthetic blends in order to meet the SN API oil specification.
In reality, the terms "conventional", "synthetic blend" and "full synthetic" are primarily marketing terms and not a "scientific" (so to speak) term.
For the most part, with a couple of well known exceptions (such as Pennzoil Platinum which is manufactured from natural gas) all modern motor oils are in reality a blend of different base stock oils that have been highly refined, and an additive package which contains detergents, dispersants, antioxidants, viscosity index compounds, anti wear compounds, anti-foaming agents, etc., in order to bring the final, finished product to the point where it meets or exceeds manufacturer or industry standards, specifications, and requirements (such as Dexos.1, ILSAC GF-5, SP, etc.).
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