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.
Step 2: Some parts of the automobile system I can't change yet.
Some recent measurements:
Weight of a full quart bottle of 10w30 synthetic motor oil 848.50 g.
Weight of empty quart bottle 51.09 g.
Net weight of oil 797.41 g.
Test: Pour motor oil out of bottle for 1 minute. Weight of empty bottle 51.32 g
Attach empty plastic oil bottle to drain jug for 45 minutes. 47.09 g
Approximate weight of oil recovered 4.23 g
Oil recovery ratio, 4.23 g / 797.41 g = .0053 ~ 1/2 %