just finished my oil change....filter and oil. used maxum 10w40 synthetic. i sit down and thumb through the owners manual and notice that it asks for 20w40. what the hell is 20w40? whats the diffrence, please explain i need some schoolin?

and am i okay? or do i have to get the 10w40 out and replace with 20w40. I'm racing saturday and need to know asap.

 

10W40 amsoil Synthetic is what I use.

 

are you riding a YFZ and if so how long have you been running with that?

 

yamahalube...... use wut the manual reccomends or look in mags to see the kind the racers use

 

I use Yamalube 4R...but any quality motorcycle oil within weight specs will work. Valvoline makes some good 4-stroke oil too.