Another little tip is to purchase a second air filter and get yourself a couple of the larger plastic zip freezer bags. Once your filter has been oiled put it into the bag and it's ready to go for you next change out. Plus any excess oil will accumulate in the bag not in your air box.
The filter skin is fine BUT you still have to oil the filter. The filter skin is not catching the fine dust particles. That is what the oil does as the fine dirt passes through the filter it sticks to the oil. Without oil the dust can just pass right through filter.
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