Since there is no issue with freezing here, I only run a quart of 2 stroke oil per tank at fill up. After reading some of the posts, maybe I am using too much. There is a thread around that had a link to a fuel additive research study. Many additives that claimed this and that (including extra lubricity) had terrible lubrication qualities. As in worse than using nothing at all. The very best (for lubricity) was biodiesel, followed by 2 stroke oil. I do not remember if ATF was tested. Maybe someone else can find the thread/link.