Warm up the engine for better oil flow. It is not worth draining very hot – there is a high risk of getting burned.
Loosen the drain bolt on the crankcase.
Place the oil container underneath and unscrew the drain screw.
Drain the oil from the crankcase into a container.
Change the washer on the drain bolt, then screw it back in and tighten with a wrench (do not overtighten).
Next, you need to change the oil filter.
This requires a puller.
Unscrew the filter with a puller.
Remove the filter. The oil will run, so you need to substitute the container.
Remove the filter element.
Change the O-ring, lubricate it with oil and insert a new filter element.
Put it all back and twist.
Unscrew the oil filler cap
Fill in new oil.
Next, you need to start the engine and let it run. Then check the oil on the dipstick and top up if necessary. Remember to make sure there are no leaks near the oil filter and drain hole.