aFe MagnumFLOW Air Filters OER PDS A/F PDS BMW 5/6/7-Ser 77-89 L6M3 88-91 L4-2.3LConstructed with 100 percent polyurethane boxed frame, this non oiled OE replacement filter provides years of hassle free service. Three Layers of Progressive Synthetic (Dry) Media for Maximum Convenience. Washable and reusable for multiple cleaning cycles, the tall open evenly spaced pleats provide excellent dust holding capacity for longer service cycle between cleanings. Integrated urethane bump seal insures tight, no leak seal over the life of the