I use straight 30 as per cam companies rec
I have used others too. 30 seems to work good. I have just been using the normal valvoline that you can get at wal mart. With a bottle of eos. If I am running over 300 psi open I only run the outer springs and then add them later. Big thing that I have found is to make sure the engine starts right away with out cranking it much. The cam isn't getting oil while cranking and I have seen that wipe some cams out. Prime the carb, make sure your dizzy is close to where it needs to be.