My son did that for me once.
If the gasoline caused the engine to sieze due to lack of lubrication it could require some shop repair.
With a little luck %26amp; not much expense, drain the oil tank %26amp; refill w/ the proper oil.
Remove the spark plug %26amp; turn the engine w/ the starter cord %26amp; if stuck... by hand.
If it will turn easily , replace the plug with a fresh one %26amp; try starting normally.
Good luck.My lawn mower is broken. Gasoline got into the oil ';tank'; accidentally. How can I fix it?
Drain everything well and start with new clean oils and fuels etc. also a good time to check spark plugs, air filters and blades.My lawn mower is broken. Gasoline got into the oil ';tank'; accidentally. How can I fix it?
turn the lawn mower on to its side %26amp; let everything drain out leave it 4 a couple of hours so it dries up inside (on its side that is) then fill with oil and petrol and turn on