K& N Cartridge Oil Filters are designed to satisfy the needs of racers and engine builders as well as the average vehicle owner who wants the best oil filter available. K& N cartridge oil filters trap harmful contaminants while the filter's construction allows for high oil flow rates. All K& N oil filters are manufactured to meet stringent engineering standards. They are covered by a limited warranty to be free from defects in materials and workmanship when installed and replaced using engine and equipment manufacturer's recommended service intervals.