I use this small pump.
http://www.autozone.com/test-scan-a...-fluid-transfer-pump/94647_0_0/?checkfit=true
3 seasons now for both Volvo Penta and Yanmar diesels using this pump.
The difference is that this actually pumps the oil and not air.
We like it because we can watch and measure the oil as it is removed and put in re-used milk or bleach gallon jugs for measurement and proper disposal.
The key to "dip stick" removal is cutting the tube to fit the exact length needed and the end to be cut on ≈60° angle. This allow the tube to be close to the bottom of oil sump as practical without tubing "curl".
I am a "cold oil" fan, since all of the oil has gravity drained to maximum to the sump.
I also examine the oil filter draining separately and compare to see if I have salt crystals in that oil. This is a hint of Riser problems if salt is found. I can simply test that oil for salt... but that is another story.
My son-in-law (had his own boat service company) helps do all of the spring servicing and actually prefers this pump over ≈8 different ones he has used.
Jim...