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In general, M1 and Amsoil(with the exception of XL) are full PAO formulations, non-GC Syntec is Grp III with possibly some PAO and/or ester content. Redline, of course, is ester.
All the rest, Maxlife Synthetic, Valvoline SynPower, Quaker State Q, etc. are primarily Grp III.
- Just my personal rating system based on perceptions, as the current MSDS format doesn't actual reveal specific base oil content.
And, of course, I won't mention Royal Purple, as I don't want to deal with "incoming rounds" on that subject!