Engine oil gasoline for All OHV and some OHC small engines' grades and (API) required

Most lawn, riding, zero turn, wide walk behind, stand on, pressure washer, water pump etc use API SJ for most engines, and sae 10w30 or sae30/40.

Briggs and Stratton including Vanguard: synthetic 5w30 great for all temperature and synthetic 10w30 is fine too
https://www.briggsandstratton.com/na/en_us/support/faqs/browse/mower-oil-type-and-capacity.html

Kawasaki: synthetic 10w30 is best choose for all temperature...

Engine oil gasoline for All OHV and some OHC small engines' grades and (API) required