Anyone use one for changing oil? My boatís PO installed a brass galley style hand pump in the pilot house with a hose down to a fitting into the engine sump. It sort of works but is a PITA and a mechanic recently told me the fitting doesnít reach deep enough into the oil pan to extract all the oil. Plus my aging arms and rotator cuffs donít really like it. So Iím thinking a little portable 12v pump with a tube down the dipstick tube might be a better option. (This is a big old Detroit 3-71 that carries over 3-1/2 gallons of oil.)

I see there are many pump kits made for this purpose at all price ranges. Or seems I could just buy a decent pump and attach my own ďkitĒ of tubes and hose. Anyone have a favorite kit or system?