WIX Premium Panel Air Filters provide excellent engine protection for normal and severe driving conditions such as stop and go traffic, dirt roads, construction sites, short trips, and interstate travel. WIX filters are recommended for OEM air filter change intervals. These filters contain 30% more media than OES filters and use a phenolic resin treated enhanced cellulose media which provides excellent durability against moisture ingestion. When applicable, the high-tear strength polyurethane seal survives extreme hot and cold temperature conditions. Air filter Laboratory Tests per ISO 5011 at least 99.5% efficiency (Based on Wix 42389)WIX HD Air Filters feature premium filtration media with skip a pleat media stabilization (where applicable) and pleat stabilization beads. WIX HD Air filters are recommended for OEM air filter change intervals. Polyurethane and or high strength corrosion resistant end caps and expanded metal bodies ensure a durable long lasting filter. Air filter Laboratory Tests per ISO 5011: Minimum efficiency of 99.9% contaminant removal. (Based on Wix 46664, Wix 42803, Wix 46761, Wix 46433 )