Everything I own, OPE wise, is 2 stroke. I mow every week, well not right now, with my 45 and 47 year old Lawn Boys. My Bricktop has the D433 engine, and the 7262 has the D600. I have an email directly from Amsoil stating that they don’t recommend going any thinner than 50:1 in my old green machines. I usually mix either Amsoil Saber or Echo Red Armor between 40-50:1 with ethanol free fuel and they run great. They both still start up with one or two pulls and run nonstop for the roughly 1-1/2 hours it takes me to mow.
I also run the same mix in my Echo CS370 chainsaw, my Poulan and Husqvarna trimmers, my Hitachi leaf blower, and my late 80s Toro CR20E single stage snow blower. So one gas can with one mix in it for everything.
L8R,
Matt