With the engine off and the plug wire off the spark plug, you will need to remove the drain plug on the bottom of the engine. Drain the oil, install the plug and fill with 30w oil.
Depending on what lawnmower you have just simply take the spark plug out and tilt lawnmoer
youtube - push mower oil change.... oil plug under mower deck
Depending on the model of the Craftsman lawnmower, there is either an oil plug underneath the deck of the mower which needs removed to drain the oil or the lawnmower needs tipped on it's side to allow the oil to drain out through the oil cap area. Once oil has drained you will want to refill the oil until the dipstick registers "full".
Yes 10w30 is a good oil for snowblower or lawnmower.
Refer to user manual if you have one. Most engines have a small plug at the bottom of the oil receptacle which allows the old oil to be drained.
If the wrong oil is used in a lawnmower, do not start it. Simply drain the oil as completely as possible and fill with the proper oil.
When you overfill oil in a lawnmower it will smoke when you tip it sideways while mowing,it has no harm
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drain it.
to put the oil in the lawnmower's crankcase would be fine, so long as it is an appropriate viscosity.
Click the link and then look up your engine based on the model number.
SAE 10w30 full synthetic and change it once a year.