Everyone will always have a story to tell for or against anything. When I first started racing Legends, I was using a conventional motorcycle oil (don't remember the brand). We had a race in Sun Prairie that was pure mud. My temp gauge was pegged at 320 and the oil was burnt and black. I changed it that morning before the race. That is when I switched to Amsoil. Have never been over 220 since, even in similiar conditions. Engine had 70+ races on it when I took it out, and no problems whatsoever