A couple of weeks ago I had the same problem on the same fitting as everyone else. I basically destroyed the front flare nut by using vise grips. After a week of daily soaking in Kroil I finally was able to remove it. The threads were still good despite the badly rounded nut. I made sure to put anti-sieze on them and covered the joint with grease as the previous poster suggested.
I will be replacing the filter at least annually bacause I hate spending an hour on what should be a five minute job!
