BeerCan - do you live in a "normal" area? No significant dust from gravel roads, etc? It's encouraging to me that you've got 38k miles on the filter. But in one year, that's a LOT more than I travel. In theory, I could go nearly five years to accumulate that same 38k miles. However, I'd be concerned about mold in my filter due to the long exposure, not so much the miles.