When you open and pour a quart of motor oil, about 1/2 % clings to the container.
It is a mess to fiddle with the empty oil containers and try and drain the little bit of oil that remains.
This Instructable shows a way to catch that oil that uses an empty jug a home mechanic already has. A well placed snip to the neck of the jug makes it hold the empty plastic oil containers steady and straight for a leisurely drain.
The pictures show a rinsed out popular green degreaser jug. Another common container is an empty windshield washer fluid jug. Don't use any container that might be mistaken for a food container.
Step 1: Snip with sidecutters, label the oil collection jug.
If the label specifies only one grade of oil then you can put the oil to use later.
Do not use a food container to hold motor oil.
Keep the container away from kids.
The electrician's side cutter in photo makes a 1/2" notch in the neck of the jug.