i wouldnt risk runnin anything but 32:1, 4 ounces per us. gallon, but watch the
"amsoil dominator" sh*t, i had serious probs with it at 32:1, it says its heavy on lubricants and to run it at 50:1, and an email from "amsoil" confirmed that, i went back to yamalube and maxim, and its runnin better