Any chance you'll be using Amsoil Smal Engine 10w30 Oil in a new mower? I've been using that in my push mower since April 2018, when I got the mower new, though I did try breaking the engine in (if that's a thing anymore) with the oil that came with the mower. I'll change the Amsoil oil once a year, but it should extend the mower's life considerably. It costs about $10 per quart, but if it means that I don't have to buy a new mower within 20 years' time, a $5 oil change is really no big deal to me.
https://www.amsoil.com/p/10w-30-synt...A#pills-home_0