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Reply to "GROUP III"

all the additives used in a PCMO are MFG as in reacted so Id say they are synthetic BUT the dilute base oil used to dilute the additives for a blender to use are mostly GPI.

That said most people do not or think or care about additive diluent oil. And I think the syn or dino applies to the "rest" of the base oil used.
bruce
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