That would depend entirely on the particular Toro mower you're referring to.
All of them that I've had ran happily on 5W-30.
Drain it out again and rinse it out with gasoline.
basic 20 - 22 inch cut mower?..... 20 oz max size of a soda pop bottle out of a vending machine
SAE 30 or 10W30 full synthetic any major brand.
Yes alot of the new motors have the oil level safety switch in them.
SAE 30 full synthetic oil, any major brand.
The best way to change the oil on a Craftsman Eager One lawn mower - 6.75 HP is to buy a Toro.
what kind of oil for a sears push mower and how much?
SAE 10W30 any major brand. I recommend you use synthetic oil in any air cooled engine.
If all oil the mower will not start. If only a little oil, the mower may start but run rough and smoke very much.
Drain out the excess. Too much oil will damage the engine.