I did the first oil change on my Clubman today using the Mityvac oil extractor. (Model, #07201). Since this is my first change, I thought I'd see how good a job the Mityvac did sucking out the oil.
I had the front of the car up on low ramps, about 5" high. I started by partially unscrewing the filter housing to allow any oil trapped in there to flow down, and I waited about 10 minutes.
I had two issues with the Mityvac. First, it was difficult to sense when the suction tube put down the dipstick tube "bottomed-out", so I marked the tubing using the dipstick length as a guide. Secondly, the Mityvac didn't get all the used oil. After it sucked out all it could, I drained any remainder by opening the oil plug, and another six ounces came out. An ounce or two wouldn't be an issue, as you never get all the old oil, but I thought that six ounces was a lot of old oil to miss. Since the drain plug is really easy to get to, I think I'll skip the Mityvac next time, and just use the oil drain plug.
Also, I'm happy to report that this was a really easy oil change. The filter comes right off, and is easy to put back on and torque. The drain plug is also easy to access. The complete change took about a half hour, and probably 10 minutes of that was fiddling with the Mityvac. The car took 4.5 quarts (R55 Clubman, base engine).

 

I agree, this was probably the easiest and least messiest oil change I have ever done on any vehicle. Piece of cake. I was done in 10 minutes or so.

As far as those vacuums, I only use those things on my jet boat and let it pump out the 12 qts into the jugs. I've learned, for cars, they end up being more trouble than they're worth. The oil also has to be warm to hot to get them to work efficiently. Oil should always be changed warm anyways.

 

RaceFace - on my last car (BMW wagon) the Mityvac worked great, extracted all the oil, and saved me the trouble of putting the car up on ramps and getting under to change the oil. It's also much less messy, since you extract all the oil into the unit, then flip a valve on the unit and decant the oil into another container for recycling. But, if you can't get all the oil out, it doesn't make much sense to use it.

 

could it be possible that having the front on a ramp prevented all of the oil from being extracted through the dip stick tube?

 

I tried to use a flexible plastic tube to remove some excess oil put in by the dealer, who put in 5 qts instead of 4.5. It's really hard to thread tubing down through the dipstick channel. I had trouble just getting it into the oil, I can't imagine getting it all the way to the bottom to get all the oil out. And the oil needs to be pretty hot as well.

 

when i use the mityvac i always make sure to warm up the engine by driving the car for 10-15mins. then I let the car sit for 10-15mins after opening up the oil filler cap and loosening the oil filter. oil always ends up being super hot and flows very easily

I haven't had a chance to examine the dip stick tube in my MINI yet.

 

I had no trouble threading the Mityvac suction tube into the dipstick, but I did have trouble finding the "bottom" of the oil pan, as I suspect the tube comes into the pan on an angle, not straight up-and-down. I think having the car on ramps may have also been an issue, especially if the dipstick tube enters the pan at the front, which would have been higher than the rear, where the drain is located. I'm going to try the Mityvac one more time next oil change, this time without having the car on ramps, to see how well it works. I really didn't need the ramps anyway, as I can easily get to the drain plug without them.