Quote:
Originally Posted by lkchris
...EVERYONE in the industry will testify that more oil is removed by vacuuming than by draining...
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I can say that based upon my unscientific tests this statement is untrue in fact I don't see how it could even be true. How is it even possible to suck more oil out than you'd get by draining from the plug at the bottom of the pan?
I have, on 2 occaisions in 2 different cars used the vacuum method and then removed the drain plug and always had some additional oil come out. Not much, probably a couple of ounces at most. I didn't wait very long between removing the tube and opening the drain plug either so it was not that the oil had a chance to drain down out of the engine.
I really think the difference is negligible and the reason the "industry" has adopted this process is because it is easier than using the drain plug and eliminates the risk of stripping the threads or starting a leak by not replacing the crush washer.