If you include hydraulic filters, I'm probably pretty close to 100 "oil-type" filters, maybe another 20-30 or so of various air & fuel filters.
I have 4 trucks, 2 cars, 2 motorcycles, a dozen pieces of gas & diesel powered farm & construction equipment, an airplane, log splitter, tree chipper, generators, etc. etc.
I often buy quite a few rock auto clearance specials from time to time for my "charity" oil changes.
Threads in 18mm, 3/4", 13/16", 20mm (Korean) and 22mm Ford 4.6/5.0/5.4 in various random varieties "to fit most".