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One of my pet peeves in changing oil is that if you aren't careful, warm (if not hot) oil will run all over your hands. Further, almost always, I lose the bolt in the bottom of the oil bucket.
Here's my idea. Cars come equipped with the oil pan bolt... the bolt is removed... BUT NOTHING COMES OUT YET! Why? Because there is another step.
The oil changer then takes a wrench, after removing the bolt, and turns a nut (or for that matter, uses his hand to lift a lever, turn a knob, etc.), and THEN the oil comes out.
This gives double protection against a leak... and it makes oil changes much cleaner.