Yes it does get confusing , i just cant make up my mind either on what to run for oil petro or sythetic from the get go. I just got a new Fox 3.2 and Fox says to run petro base oil for first 5 gallons then swith to Klotz or Amsoil. I have been using Amsoil racing seiies 2000 sythetic for the last 3 years on all my Brisons and have had good results . Good luck i think its a toss up.