RE: How many quarts of oil do you fill?
I use a white kitchen trash bag because they're a little thicker than grocery type plastic bags.
As far as needing an oil pan, don't bother if you're gonna get the EZ drain valve. I dump it right into old oil jugs. Once one fills up, I flip the lever over to close it, put another jug under, and open it up again. I haven't used an oil pan since.