I had one.

It worked pretty well on motor oil but it would leave about a half quart or so of dirty oil behind.

It was a ***** to clean (took way longer than an oil change), and if any little thing happened to the seals it would not work at all. It had to be cleaned thoroughly after every use with simple green and a lot of water. That was messier than an oil change but that may be just me.

So every other oil change you would have to do a full drain and fill anyway so I got fed up with it and sold it. Only got $35 or so for it. They’re hard to ship I guess and people know the seals can go bad. Mine was perfect and I still only had one look in like 4 months when selling it so they’re not really sought after.

I never got around to doing the transmission. Seems like it could work if you could get the tube to the lowest part of the tranny. Since you have an 03 and it has the dipstick it’s a maybe. Others may know more.

It’s fun to watch it work when it does actually work, but it’s kind of finicky getting it to go every time.