Klotz has been around a while, I used it in my 2 stroke dirt bikes, but don't know about their other products. DrDoug mentioned a very important point (IMO), about availability. There are many good oils, I use brands that I can find in any town on any day of the week. I can't remember the last time I needed a qt. of oil on a Sunday, but if I ever do, I won't have to substitute. :bigsmiley11: