K&N replacement oil filters for Western Star are available for all models listed below. Select a link below for replacement performance oil filters made to improve engine performance for your Western Star. K&N replacement oil filters are designed with a heavy duty construction and rolled threads to provide extra protection against bursting or stripping. K&N replacement oil filters are also made to trap up to harmful contaminants and protect your Western Star from engine damage. K&N performance oil filters should be replaced according to the recommended oil change interval for your Western Star.