I own a 1996 2.0L Zetec Contour and the replacement oil quantity is 4.5 quarts, per the manual. The original Motorcraft oil filter was the FL200S, a great filter, no longer available. Wix, Purolater, Mobil 1 and I'm sure others offer great filters. I know that Napa Gold aka Wix filter is the same spring bottom bypass valve as the Motorcraft oil filters. Purolater oil filters have the valve in the dome. Whether that makes a real difference is yet to be determined. The FL2005 was for later 2.0 Zetecs with the variable valve timing. Use a filter that has a silicone ADV, ie any color except black usually.
Whimsey