Oil protects your engine - but what's protecting your oil? PurolatorBOSS Oil Filters with SmartFUSION™ Full Synthetic Media give you Maximum Engine Protection for up to 20k miles. Only PurolatorBOSS filters feature a Double-Helix Center Tube built with superior strength and designed for optimal oil flow; a Silicone Anti-Drainback Valve to prevent dry starts; a PuroSEAL Ethylene Acrylic Gasket™ for maximum leak protection and life expectancy, and a Heavy Duty BOSS Steel Casing™ to withstand extreme pressure. PurolatorBOSS filter are ideal for all oil types. These rugged filters are built for frequent short trips, stop-and-go driving, towing, off-roading and dusty conditions.