opti 2 worked good , i just noticed the motor ran a bit hotter even rejetted rich. and from my experiance and to the best of my knowlage... the higher the rpms the more oil is needed to keep up with lubrication and when running 100:1 it kept getting hotter than i wanted it to be and i had to limmit the rpms i drag raced at for fear of over heating and scoring up at around 9,000 rpms... below that however opti 2 worked out great and i was actually able to run a smaller jet and still be a tad rich due to how little oil is in the fuel. i just found that once you got up in the 8500 pluss aria and kept it there the motor would "all of a suddden" over heat real quick even though it was jetted rich on the main, i concluded that it was not recieving enough oil for the friction at those sustained rpms to keep the motor from tearing itself up and that made me nervouse so i switched back to lucas oil
i would love to give Royal Purple a shot but i cant find a dealer for there 2 smoke oil