I use any 5w30 fs for my toro single stage.
Next time I might try Amsoil's small engine oil:
https://www.amsoil.com/p/5w-30-synthetic-small-engine-oil-aes/
"Modern cars and light-trucks are equipped with all sorts of emissions sensors and devices. Some motor oil ingredients such as zinc can cause issues with these components. Therefore, modern automotive motor oils require a fairly sophisticated formulation approach. As small engines do not have emissions sensors and catalytic converters, AMSOIL is able to load this motor oil with anti-wear additives like zinc and phosphorus.
There is also another benefit to using this small engine oil over regular car motor oil. AMSOIL added significant anti-rust and corrosion ingredients that would not be found in automotive motor oils. Small engines are frequently stored for long periods. They may also be left outside or operate in wet conditions. This ability to prevent internal rust is a benefit to almost any small engine."