I use Schaeffer's 711 10w30 HDEO syn blend (Grp II+ and Grp IV) in my semi truck, my compact tractor, my JD zero turn mower, and my Yamaha EF2000is generator. Great all around oil. Delivered free to the house for less than $20 a gallon, which includes tax. I have grown partial to the syn blends the last few years.