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I've been talking with Amsoil and Redline and neither one wants to disclose their ratio of PAO (Group IV) to Polyol Ester (Group V) base stocks. Redline said that it was majority PAO but "close to half" Ester, and Amsoil said their mix is "similar in ratio" to Redlines.
I'm actually pretty interested to try out Amsoil's Boosted XL line. While being group III base stock it has some pretty impressive specs on paper.
Also, High Performance Lubricants, based in Manteno Illinois, has some impressive lubricants, all of which are PAO based Mostly.
Schaeffer's 9000 is also a quality PAO based lube.
I'm bored at work and I nerd out on this stuff. It would be interesting to see used oil analysis of these products in more hard-working, high performance engines. Bob is the oil guy is great, but it's 99% boring daily driver cars.
I will be doing a shootout of sorts between a few of these. Logging oil pressure and temp and then sending them for analysis after they've served their purpose in my SR. Gonna take a while though.
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