Engine oil, I have been using and most will say 20W50, if Valvoline is mentioned. For transmission, again Valvoline is one, but there are other solutions and I am sure others will chime in (aside older posts that may still exist on this subject). The advice I hear over and over is to be sure the tranny oil used is a non detergent motor oil for contaminants remain suspended due to no filtering system to catch, other than the existing screen at the bottom which works on gravity (I believe).