https://www.walmart.com/ip/Super-Tech-Non-Detergent-SAE-30W-Lubricating-Oil-1-Quart/52626201
Lawnmowers use non detergent "straight weight 30"Don't go to the automotive aile... Shearch the Garden center.If it says ND 30... That is what you are after. FYI... As far as ATF is concerned... Type F has extra "grit" in it for the old Ford tranny clutch packs.Dextron (GM) has much less as does Mercon (later FoMoCo)
I get mine off Amazon, https://www.amazon.com/gp/aw/d/B000BXOGMY?psc=1&ref=ppx_pop_mob_b_asin_titleI change all my small motor oil annually with this.