Always ran used 10w30/40 out of the truck too BTW, I'd change it seasonally in the truck, and the mower would get the dump out of the Truck.
Mowers going on 10 years running and the trucks at 250K
The mower has since been replaced as the ignition switch (now a screwdriver and two wires) and the deck has rotted.
Dad still uses it for hauling a dump trailer behind, simpler than the zero turn they replaced it with.
Still runs the same oil and filter that I ever did.
Fwiw, I've seen rider style and push style B&S engines in the army get worn to [censored] and back. With everything from Turboshaft Aircraft Turbine oil, to dumped 15w40 transmission and engine oils, to regular weapon CLP in the oil sump.