I agree with all the reasonings of doing an oil change from under the car, as it was made to be done. But one thing that has not been addressed yet is the suction created inside the engine. Since I am totally ingnorant of this inane idea of sucking through a dip-stick tube, I have no idea how much suction is created while extracting oil the lazy way. I would be concerned with the suction pulling on seals, etc.

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