boblyon1,
I change mine every time since the
oil came from the engine anyway....
The simplest way I know to do it is to turn on the Accusump when the car is to be drained. It should empty itself into the crankcase.
I warm up the car beforehand leaving the Accusump on so it will drain more easily and completely.
When refilling add three quarts to your regular capacity. Mine ends up taking a total of ten quarts including the filter; yours may be different.
Crank the engine afterward with the Accusump switched on so it will refill and you should be good to go!
Tom