I change mine every time, but that's mainly because I can never remember if I replaced it the last time or not. It's probably a good idea, though, because my K1 gets more use than any of my other vehichles. The recommendation is to replace the filter every other oil change, so I'm sure it's fine to do that, but changing it every time won't hurt anything either, and considering the few bucks a new filter costs the price of doing so is of little importance to me.