Purolator PBL21478 PurolatorBOSS Maximum Engine Protection Oil Filter - PurolatorBOSS premium oil filters are the next generation in oil filtration, delivering maximum engine protection for up to 20,000 miles*. PurolatorBOSS exclusively features SmartFUSION Technology – a full synthetic filter media with reinforced polymer mesh backing for over 99% Dirt Removal Power. Engineered to work well with all oil types and viscosities, especially full synthetic oil, PurolatorBOSS is ideal for the most demanding driving conditions, including frequent towing and hauling, stop and go traffic, long commutes, long idle periods and extreme climates. Widely available for most vehicles on the road today, PurolatorBOSS combines the latest filter technologies for long-lasting protection and advanced engine performance.