Looking to finally throw some synthetic oil in this US General compressor, but for the life of me, I'm having brand difficulty.
Royal purple it seems only sells their ISO100 in quarts.. Which usually, ISO 100 is 30w, if I'm not mistaken.. Amsoil lists it as 30/40, which I find odd.
Royal purple makes some sort of 100.. I assume they mean iso100..
Then there is ol' IR Synthetic lubricant..
Either way, I can't find anything local, so I have to order..
Compressor calls for 30W.. Any (educated) opinions?