K&N Powersports Cartridge Oil Filters are designed to satisfy the needs of racers and engine builders; as well as the average motorcycle or ATV owner who wants the best oil filter available. K&N Powersports Oil Filters are 'TUV' product endorsed and 'TUV' factory production monitored. K&N cartridge oil filters trap harmful contaminants while the filter's construction allows for high oil flow rates. K&N Oil Filters 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.