This is the oil change pump I have:
ATPTOOL12V 60W Oil Change Pump Extractor, Oil/Diesel Fluid Pump Extractor Scavenge Oil Change Pump Transfer Suction Transf
Sold by: ATP
$17.88
I did not take the dipstick assembly out. I used a squeeze container like the old ketchup squeeze bottles they use to use in restaurants or the ones in BBQ restaurants. Took a few minutes, but it was easy.