RE: STOP with the oil ratio threads, please.
D.A. tells you what percentage to use for breakin in the manual. Use an ashless oil non synthetic for break in. D.A, specifies lawnboy. I run 4 gallons of lawnboy through all my D.A. engines then switch to a hi quality synthetic such as Redline racing oil or Amsoil. I read in Model Aviation I think, that one of D.A.'s service crew prefers redline oil due to less ring fouling/ gumming. I tried it and picked up 200 rpm over amsoil. I just have to ask if you read your qwners manual before starting this thread. Go with what D.A. recommends!