Hey, I am trying to figure out which oil to use to get the best performance out of a Honda F4i wet clutch motorcycle engine. Right now the idea is just to use the oil recommended by Honda (called GN4). However, I was curious if there is another oil that I could use that would keep constant viscosity as heat is appled over time, not allow the clutch to slip due to excessive lubrication, and will maximize horsepower all while staying under $5 a quart. I know, it's quite a few requirememnts. Also, would additives like zinc be something to investigate? Any help is appreciated.