Sea fom works. So does sta-bil.
But i think sea foam works longer an it does more than stabilize.
I use 1/3 can to 5 gallons year round. I buy it by the jug, savings add up to one free can.
mower is near done for the year, except for mostly chopping up leaves. Think I will get a can of Sea foam and put a little in the oil to loosen things up for next oil change. Will dump the rest in the fuel tank.