Actually I've been using super tech motor oil with a zinc additive in my Husqvarna lawn tractor that has a Kawasaki twin engine. Been ok since 2002...has over 600 hrs on it with yearly oil changes.
Recently filled up with shell 87e10 here....$2.93 a gal, it's slowly coming down.
I saw the price for 87 at a mobil station today for 2.39 a gal., so the old trumpster has been hard at work.