My old Groco oil change pump has finally given up the ghost after several repair attempts by Groco. This pump is a bronze vane pump and suffers from overheating. The replacement pump is gear driven. Looking at Reverso I see that they make impeller pumps and gear driven pumps. Orberdorfer makes a gear pump as well. I suspect that the gear pumps work a lot better than the vane pumps. The impeller pump would work but owners I have spoken with talk about frequent impeller changes. I have Detroits that hold a lot of oil so one of the 5 gallon bucket ones will not work. I need a built in pump. Any advice? thanks Frank Burrows    79 43' Viking   Piney Narrows  Chesapeake Bay