Can't find it on the Rislone website and links to the old hyperlube.com just redirect to Rislone, ordered a couple bottles on Amazon and I'm crossing my fingers I get the right stuff. If I do I'm stocking up, if I don't I'll send it back. My understanding is it's a fancy PolyEster oil, really bad question though... Could I add some HVAC system PolyEster oil and get the same end results? I think the answer is no for a lot of good reasons but asking dumb stuff is a good way to learn.