Lets try this again, I looked over my set up and I think the only way to get all the oil out is to let all the other lines drip back to the pan like Griff said.
Then hook up a vac pump to the line that goes to the bottom of the cooler. On mine its accessible at the top. All I`d need is an adapter to hook to my -10an line.

The box is a vacuum pump btw , I`m an awesome drawer

thats some funny chit right there.i can see mr borgie,s blood pressure rising,lol.

Nice drawing.

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My turn

Nah that's funny as hell! Lol

You will want to lube those valves with sb's peanut oil

ICDEDPPL, first of all NICE set up!! Second, all you really would need is the small hose that the Jabsco pumps come with that go in the dipstick tube, it should go right in the cooler line & would pull all the oil right out. Mild Thunders Y valve would be slick if mounted on the bottom & accessible. That could make for a 15 minute oil change start to finish even with a big offshore pan. Or did winter finally drive me insane? Randy

I say just start the leave the engine running while sucking all the oil out. Once you see the oil psi gauge drop to 0, you should be good. Just to be sure, let it run for another couple minutes. Then refill

These avatars are getting dangerous, I was reading MT's comment while looking at the avatar & it made perfect sense!!