I think its the oil filter adapter you are talking about. Yes they can leak, just like anything with a gasket can leak. Go to motorcraft.com, enter in the cars info and search for the part. It should include a diagram of the part etc and the associated gasket(s). Good luck...
'98 3.8L Convertible (Red w/ White top)
’07 Shelby GT500 (White w/ Blue racing stripes)
YouTube Channel: Pet Rock’s Garage