I havn't been on the board in a long time but I wanted to share my experiencce with my recent purchase of a Jabsco oil change pump. First off, it's awesome. I paid $48$ delivered to my door. This is the kind that screws onto the threads at the top of the dipstick tube. I was a bit skeptical at first that it would be able to get as much oil out as the old "tube down the dipstick" type i've used before. I was wrong. It got every bit as much as the other type of pump(a bit over 7 quarts) in a fraction of the time and with almost no mess. After the first gallon it slows down and starts sucking air but it keeps pumping. I wish I would of had the sense to buy this years ago. There are lots of places to buy this. I've attached the amazon link below. Mercruiser makes one too that looks similar but the reviews are no good. This is not an ad, I'm just trying to help some people out.
http://www.amazon.com/gp/aw/d/B000O8...r=8-3&pi=SL500