I just got this off the Kawasaki Web Site. Look like Kawasaki supports the idea of 10w30 synthetic oils.... Kawasaki has such an oil in their stable.....
"10W-30 synthetic blend oil provides ultimate performance and protection in both low and high temperature applications, including cold-weather startup"
Kawasaki is no different than Honda or Briggs, Kohler or any other company, they all make or have there own oils if you want to use them., I believe theirs is called K-Tech and sure they want you to run there stuff. What I posted is what the operators manual from the manufacturer states and it says nothing about synthetic use. It
says or calls for a detergent oil (API service SF, SG, SH, SJ or SL ). Now Kohler states the same thing but it also states in a sub paragraph that says
synthetic can be used in there engines if you choose but only after 50 hours or regular motor oil use for break in purposes. Personally you can run what ever pops your cork I could care less but while the machine is under warranty I'll do what the manufacturer says to do and if I don't have any problems I'll keep doing what it says, I've always figured they know more about there stuff than I do.