I don't have filters on my cars but I do have magnetic drain plugs in all the places, pan, ******, and rear end. I change the oil every 1000 miles (easy to keep track of).
I put 1500 miles a year on my cars. No problems.
Dick Wyckoff
are you an engineer by chance
there is a shocking lack of hands on experience here....
as I said, take the challenge and then get back to us......are you afraid to pull a side cover? Drop the carb, drain tube, and cover all in 15 min or less and get your hands dirty and take a look at what you find.