There are no PAO (polyalphaolefin) synthetic molecules in Castrol Syntec, yet because of legal finagling with the definition of synthesized motor oils they can legally be called synthetic. Basically, they changed the definition of a synthetic to fit the process of highly refining a petroleum base oil, called hydrocracking and fought with Mobil and the National Advertising Council to loosen the definition of a synthetic.
I’m not arguing that Castro Syntec is not a quality oil…just that it is not “equivalent” to Mobil 1.
I hate to tell you this…but Mobil-1 now uses the same process.
I really don’t have a problem with this. If the final result is EXACTLY the same (which is what Castrol PROVED in court) then what difference does it make how it got there??