I have been running 927 in my 04 cr 250 from day one. The bikes been raced several seasons, several different series from baja style to supercross, its been to glamis umpteen times, ridden hard and put away wet. Pushed the entire time to its limits. Pistons replaced every season just because thats my maintenance routine. Internal inspection of engin will blow your mind. Hands down some of the best oil you can buy! 12 years old and believe it or not still running original spark plug.. 500 + hours.. I mix 40:1 with Sunoco 100..