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Frantz oil filters and other gimmicks...
Memories came flooding back...
These consisted of a chrome plated can that held a roll of toilet paper that served as the filter.
These were sold at state fairs by hucksters who delivered a pretty convincing demonstration of how they worked much better than the conventional types.
I seem to remember they even claimed you never needed to change oil again, just the filter.
I also remember that on some cars they would cause problems such as a severe drop in oil pressure.
Anybody else remember these?