ORIGINAL: edge_pilot
you should never mix oil 50:1 unless its made to be mixed that way. I ran Yamalube petrolium based oil at 50:1 for breakin then switched over to amzoil 100:1. I have alot of gas through both my DA-150's and they both run better everyday. As long as you run GOOD quality petrolium based oil during breakin it doesn't matter which one you use. Don't go to your local Wal-Mart and buy the Wal-mart brand oil.
What about using the 50:1 (TDR I believe) Amsoil or even just using Pennzoil Air Cooled in it? I'm gonna do one of the two for my ZDZ 50 NG.