I replace my filter every time I change my oil. For a couple reasons, one, when an oil filter becomes clogged and can no longer filter effectively then there is a by-pass valve that allows oil to flow through the filter body without ever going through the filter materiel. Also, a filter holds something close to .5L of oil. In the case of not changing the filter you are leaving up to .5L of dirty oil to mix with your clean oil. Hell, I usually have a little extra oil (about a L) that I pour through the bike to flush out all of the dirty oil. I'm quite anal retentive when it comes to bike maintainence.
|