The primary air filter does the filtering. The safety air filter, the slim inner element seated inside it, is a backup, not a second stage of filtration. It keeps dirt out of the engine while the primary's out for service and catches whatever slips through if the primary's torn or wasn't seated right. Clean the primary if it's sound, never clean the safety, and replace it any...
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Title: Air Filter Blaster | Diesel Engine Air Filter Cleaner