Most push type lawn mowers oil is change by literally tipping the mower over on its side and draining the oil out through the Oil Intake tube. I have seen some older mowers actually have an oil plug under the mowing deck. You can check there first. If you don't seen it, then assume to drian it out of the oil intake tube.
Depending on what lawnmower you have just simply take the spark plug out and tilt lawnmoer
Obviously NOT unless your god
No. Burning gasoline, combustion, is a chemical change.
No fuel filter!
Outdoor Power Equipment Website
youtube - push mower oil change.... oil plug under mower deck
SAE 10w30 full synthetic and change it once a year.
change the spark plug or check the gap on the spark plug. clean your air filter.
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".
Any burning is a chemical change. When gasoline (mostly a hydrocarbon called octane) burns, or combusts, it reacts with oxygen in the air to produce water vapor, carbon dioxide, and a bunch of heat energy, which your lawn mower engine harnesses to do work (turn the blade.)
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.
Click the link and then look up your engine based on the model number.