I have a 2003 Honda Rancher Es 350 4x4 and want to add the K&N air and oil filters. I know the ailr filter will help. My question is will the oil filter help out any, and is it worth it to put the oil filter on my bike? Thanks for your help

It depends with the oil filter if its a spin on type with paper elements inside of it then it might help a little bit. If its a fine screen type like a insert it wont really make a difference anybody can make a screen. Just stick with oem its what was designed for it.