Hmmmmmmmm. I probably wouldn't do it for a motor oil change, since I figure a drain from the bottom of the pan is probably more thorough than a vacuum removal. However, for an ATF change, as you suggested, it might make sense. The question in my mind is whether the tube could be inserted into the correct location in the tranny to remove all of the fluid.
95 Contour Zetec, ATX (wrecked, sitting in the barn)
95 Mystique Zetec, MTX
2000 Taurus SEL 3.0L Duratec
1994 Crown Victoria LX 4.6 V8
1993 Chevy Silverado 4.3 V6
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