What is recommended for changing oil in an i/o? I have to go through
the dipstick tube and will be changing once or twice per year.

I've seen things ranging from small $30 electric pumps, to manual
vaccuum pumps ($50) to heavy duty pumps set up on 5 gal buckets or
drums ($100+). I want the oil changes to be convenient, quick and
easy, but I don't need to go overboard. (no pun intended!)

-Mark