98 blaster

my son put valvoline motorcycle oil 4 stroke...10 w40 will i be buying a new 4 wheeler soon.i still runs great....for now

He premixed with it or put it in the crank case? Either way the motor will be fine. If its in the case just swap it out for 20-50. If its in the gas drain the tank if you want, you dont have to though its still oil in the fuel. Just make sure he mixed it to 32:1.
 
thats fine to put into the crank..isnt that whats recommended? or is it 10-30? either way as long as he didnt mix it into the gas or the oil injection, and if he did..just drain it lol. problem solved
 
youi dont want to run motor oil in the trans,it will kill your clutch.Drain it all and go get some belray gearsaver