I ran that in my Generac and just drained the one quart sump after a 10+ years of intermittent useage.
Oil looked good, VR1 worked where passenger car oil didnt. Plus its a nice Blue colour when you pour it in Royal Perp - take that !
I Ran the 10W30 synthetic, I got it when it was on clearacne at AutoStoned. I just put 5W40 Valvoline European in there. Should be fine, we will see.