2x Engine Protection*
*vs. average of leading standard retail brands
Engine Protection is the FRAM?? measure of a filter's ability to trap dirt particles and keep them from entering into your engine. *FRAM?? Air Filters let through 2X Less dirt than the average of leading standard retail brands.
Based on FRAM Group testing of filter efficiency of models CA4309, 8755A, 8039, 326, 6479, and their standard retail brand equivalents under ISO 5011.