Who's Done This? Shop Vac Oil Change.

[TigerInFL]

plus they've been using them across the pond for years in those upper end cars.

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[HankB]

My problem with such oil evacuation systems is that the flow of the hot oil running out the drain helps to pull, purge, sediments, stuff that's settled to the bottom of the pan.

Apparently no one is used to getting oil running up past their elbow these days.
I use a large enough drain pan.........
I'm more concerned about the crap that stays in the engine than a bit of oil on me or the cardboard I sometimes place under my large drain pan.

When I look at some of the crap that's being sold and marketed as oil drain pans, no wonder some are concerned. Junk, too small, messy. Get a pan large enough for the job, not these things only the size of a 2 gallon jug.

I guess after 50 years of oil changes on everything from tractors to trucks to cars, motorcycles, whatever - I don't worry about "ooh, got oil on the floor, now what" or having to wipe my hand and arm off with a couple of shop rags.

No argument draining from the bottom is the cleanest way to go. Boats do present the problem of either not being able to get the drain plug out (let alone, a decent sized drain pan under the engine) or lack of overhead clearance to pour fresh oil in. On previous boats I had to use a mini pump that worked by inserting a tube into the dipstick tube and hoping I got it to the bottom of the oil pan. Ever had a 6 quart oil change take an hour to get the oil out? The good thing about the Reverso is that it works through the drain in the oil pan and is a suction pump, so very little is left behind.