ACDelco PF13CL Professional Classic Design Engine Oil Filter Has a shell that is manufactured to the original design length of classic GM cars Designed with a steel core construction and a traditional mounting plate for enhanced durability Offers outstanding filter capacity, enhanced efficiency, consistent flow management, and high durability for optimal filter performance Equipped with 98% multi-pass filtering efficiency at 25-30 microns for excellent filtering capabilities Has a cellulose media that traps particles 1/3 the width of human hair to help ensure a clean supply of oil to engine components