What is filter efficiency?
The percentage of dirt that a filter removes. The filter paper or ‘media’ determines what the oil, air or fuel has to pass through and where the dirt is trapped. The more twists and turns a particle of dirt has to take, the more likely it is to be captured. The higher the efficiency, the higher the % of dirt retained by the filter. Filters are least efficient when new and become most efficient just before “plugging”.
