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It was my understanding that oil bath air filters
were better at getting the 'crud' out of the air to the point that an oil filter
was not as necessary as there was less dirt in the blowby gas. As I
recall, most industrial engines that had oil bath air cleaners did not have
oil filters. Even the ever efficient Geraman enginers did not use an oil filter
on the air cooled VW engines. They had an oil bath air cleaner. It seems
that oil filters became the norm after so called 'less efficient' paper
filters started appearing on cars.
Larrys $.02 worth
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