About 20 oz. if it is bone dry, but about only 16 oz. will come out during an oil change so that should be about what it takes to fill it to the full mark on the dipstick.
30W for summer
30 sae
If you raise the hood of the mower up it should have it on the yellow detailed sticker of mower. Normally 10w30
SAE30
10w-50
my oners manuel says 30wt regular oil or a 5-20 synthic
most mowers run fine on 10W-30 automotive motor oil.
Car oil
20-50 motor oil
30 hd oil
10w30 will do.
what kind of oil for a sears push mower and how much?