...that "toilet-paper" filter unit was made by
STILKO™ and I can attest that it 'worked' at keeping the oil "clean" but it didn't do anything for the buildup of acids!
...a USN buddy of mine had one on his Corvair, and yes the oil was
aways honey-clear in color, but it also
stank like a 100-year old
outhouse (sulphur-dioxide)!