Oil is for cooling... You remove the lube and see what temps you get. Fuel is for combustion... the opposite of cooling. The only thing that directly results in cooling is the fins or the water jacket.
Grab a gallon of 2t marine shit from walmart and mix 50:1. (20ml to 1L). This is tried and true. If you aren't trying to pull every bit of performance out of your bike possible, just don't sweat if its synthetic or not.