MAXIMA 927 Caster....you can go all the way down to 20/1 ratio.....synthetic esters....degummed caster oil....and it has that caster smell none of the others have......mmmmmm....I have just put the 3rd set of rings and piston in my RM125A and there is no wear, piston , head and ports clean as a whistle....it gets this every season....17 plus meetings a year.....and they support VMX....btw....Maxima is the biggest selling motorcycle oil in the USA......the Go-Kart boys love it too.