Depending on the angle of tilt on the engine you will routinely only get about 3 or 3 - 1/2 quarts of oil out on each oil change when using the dipstick or fill port to empty from. You will always leave at least a quart of old oil inside the crank case which is why all of these guys have mentioned different engine access points for draining the oil (transmission, various plugs that are low on the engine block etc.).
I also use a 12V Jabsco oil pump to suck out the oil and it works well enough. I usually do 2 oil changes per year to help dilute the 1 or so quarts of oil I cant get out of the engine.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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