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.