Saw this
http://englishrussia.com/?p=10076#more-10076
At one point they say that when a car is readied for shredding, it is drained of all liquids and on average this yields 1-3 litres of fuel and 25-30 litres of other liquids (coolant, oil etc.)
Does anyone have any better figures on what liquids and in what quantities you can recover from cars and heavier vehicles like trucks and plant machinery?