would like to hear what everyone thinks the best oil for 575 blowers might be,and amount held

I have the style with a check plug on the rear and dipstick in the front and a big "W" cast in the side.
I've been using the Quicksilver HP Gear lube and change it (suck it out with a syringe and plastic oil pressure line) every 20 hours or so along with my fuel pump oils.
I rebuilt (bearings and seals) the blowers at 188 hours and everything looked fine. I was also able to install 2 seals per rotor on the rear section and I put Redline Synthetic Grease inbetween them. 120 hours so far so good.