Tv repair, appliance repair, knife sharpener guys- shit would run forever with a replacement part every once in a while.
When I was a kid, there was a man who came around door to door, same time every year, to sharpen our knives. He did the pruning shears too. Dad couldn’t wait for that guy every spring.
I have a tractor from 1953. It has an oil air cleaner. Literally sucks the intake air through oil (like a weed bong actually). No filter needed ever. Just take it off spray it clean add half a cup of engine oil and go!
A lot of early vehicles had those too, great filter.
K&N air filters work this way. Every year you're supposed to wash them and spray new oil on them.
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