For the ones with the plug you just take out the plug and drain. Then put plug back in and put 30w oil in threw filler plug. 2)If there is no plug you remove filler cap (did stick) turn the lawnmower upside down and drain into a pail.emove spark plug and pull on sring and turn motor over it will remove most of it and then you can put in a new spark plug and try to start it but dont ever try to start with oil in chamber will ruin motor if it is a tractor same principle just use key and not string.