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Did my first oil change with Fumoto valve today. Sweet!
I was in no hurry and let it drip for a long time - probably 90 minutes. It was surprising how long it took before dripping stopped, even though the oil was quite hot when the valve was opened. Then I removed the valve to see how much more oil dripped out. Answer: slightly more than a tablespoon.
If that much old oil left in the pan is sufficient to keep you from using the Fumoto valve then you should let your car drain for the better part of an hour after you remove the drain plug, otherwise you are doing no better.
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