I was basing my comment on your comment, "I do have a lot of rust and crap in my system" If you have a lot of rust and debris in your system, it can clog the filter pretty quickly, especially if using a smaller micron filter such as the Donaldson filter. Or, if this is your initial cleanup with the very first filter, then it's recommend that you change it within the first thousand miles or so on a dirty system. After the first filter, then you can move to longer intervals (10,000 mile/1 year intervals). To check for a clogged filter, you can always do the hand test. If the filter is too hot to touch, then it's probably not clogged. If you can touch the filter and hold onto it, then it's a good sign that it's clogged.