Dexos is not full synthetic.
AAAaahhh, but it is. Not all synthetic is Dexos, but all Dexos is synthetic. The way a tribologist at Kendal/Phillips/Mystic explained it to me is that most everybody's full synthetic meets Dexos quals, but you myst pay a per volume licensing fee to put the name on your containers. Which is why Kendall has two full synthetic 5W30 oils. Contents are the same, but one container has "Dexos" approved, the other does not. The Dexos one costs a few cents more to cover what they pay GM .
Some oil mfgrs choose to pay this extortion, others don't.
Bob
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