I just changed my oil a couple of days ago and ran into a problem. I have always had a little cam chain noise on start up after the bike sat all night with every filter I have ever used even the factory filter. With this last factory filter the bike sounded like it was comming apart on start up after sitting all night so decided to change the filter again, I had a wally world super tec that was for my sons sentra that will fit the zx14, Installed it on the bike and I now have no cam chain noise on start up what so ever even after it sits for a couple of days. Whats up with that!