A buddy of mine has owned a landscaping business for 25+ years. Last night I was at his shop looking at his fleet of 10+ commercial walk-behind mowers. they seemed to be several years old - all had Kawasaki engines. 14 HP-ish. anyway, a couple of them had hour meters on them. He said many of his engines have between 2000-3000 hours on them. (even more hours on a Honda-powered log splitter that he runs every day) I then asked what kinda oil: PYB 10-30 in spring and fall; PYB 30W in summer. I was gonna recommend 15-40 for spring and fall but then I figured he has years of success with what he has been using and he probably wasn't gonna benefit from my 2 cents....