And it's sweet! It has the GCV160 Honda engine. I read the book for the engine (by honda) and it states to change the oil after the first 5hrs of use, and after that every 1yr/50hrs. So for me it's 1x yr after the initial 5hr change. They are calling for 10w-30 for general use and SAE 30wt for temps 60F+ or heavy duty mowing. I have about 1hr of average, st Augustine lawn, so I really doubt I fall under the HD conditions. I've mowed a lot of grass down in FL, which falls under the HD situation of mower stalling out, grass is 3' high etc. I've always used SAE 30 for the first year or two then switched my engines to SAE 40wt. Mind you these were 1980's, and mid 90's Briggs L-head engines that saw 1/2 acre per cut, 2x week in bad conditions, running them hard, WOT etc. But this is a brand new, 2009 Honda, OHV engine mowing a small sub division lawn 1x week/1hr per cut. So what do you guys think? I'm debating running just 10-30 Dino or 10-30 M1. Should I hold off on the 10-30 M1 for the first change, and do 10-30 dino?