yeah well it depends on if ya want it to move slower or faster? can use what ever oil ya want, but a thinker one will slow it down, ive even used INOX to see what works best

if it is running like a mover on 1/4 choke then it will be running to rix in the mix, so my bet would be the needle is worn or the main jet is worn, or the oil in the slide is to thin