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You know I had the same thing happen to me. My filter stuck like super glue to the filter base plate. I had to tear it off to remove it. But I have never had the oil break down or dry up. The filter was a NoToil filter. I had it so I used it. My Twin Air's were dirty. Since I have been use my Twin Air's I have not had that problem. I will not use their Filters but I like the filter oils and cleaners.  Was the filter that degraded on you a Twin Air or No-Toil? I like No-Toil.