All Synthetic motor oils are made from the same process, where they take petroleum oil and continue to refine it. The major distinction is the price , where the best synthetic’s are processed more extensively. Is this so?
Not so! There are 3 groups of synthetic oils in use today in automobile engines. Group III which is actually "phony" synthetic oil. As described above it is protroluem oil that is refined over and over. Group III base stocks are produced by further hydrocracking of Group II base stocks. For the most part this is what you buy off the shelves in stores. Most manufacturers have labeled their group III based oils as synthetic in the US for reasons of economy and marketing.
Group IV which is made by converting natural gas into polyalphaolefins, and is much better then petroleum oils. Mobil 1, Amsoil, Royal Purple are all group IV oils.
Best of all there is group V polyol ester, which are man made and offer the best protection for your engine that money can buy! Oils such as Redline , Neo are group V.
