I've used a small brass stirrup pump to remove the used engine oil from a small boat engine via the dipstick tube, several times. Yes, it's a bit slow, but is speeded up by running the engine beforehand so the oil's thinner.
The boat I'm currently involved with has had a new engine (4 pot, 1500cc diesel), and because access is often difficult on marine installations, the engine manufacturer has provided a "built in" stirrup pump, already connected up to the sump. I must check the tube sizing - for ease of use, I think the tubing is a little larger that that which one inserts down a dipstick tube.
Oil recommendation
Moderator: RichardW
Re: Oil recommendation
Martin
1995 Xantia TDLX (deceased )
1995 Xantia TDLX (deceased )