No man. I know i cannot explain it properly because of my limited knowledge but after going through tons of foreign bike forums, and especially BobIsTheOilGuy motorcycle forums, i decided to give heavy duty engine oil (HDEO) a chance. A lot of sports bike, street bike riders swear by using HDEOs in their bikes, notably Chevron/Caltex Delo, Shell Rotella/Rimula, and Mobil1 Delvac. I know it would come as a shock to people here. I have always used quality motorcycle oil (liqui moly, kixx, zic(its ok)) so i gave a lot of thought to this.
You can search on google on using shell rotella/rimula, caltex/chevron delo in motorcycles, you'll get your answers. If you're curious about this i can explain in greater detail. As for API rating it's API SL certified