amsoil ester based?

ok, so I have spent about an hour reading thru postings here and still haven't come up with the answer: is amsoil 20w50 mc oil ester based? any input? I know, its another oil post but hey, I'm sure someone here can answer this...

yes,,ester based tier 4, grade 4 oil

Amsoil uses true PAO and Ester synthetic base stocks combined with state of the art additive technology.

ok, I imagined that it most likely was, just wanted to hear it from someone else. thanks.

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