My paper air filter with approx 20,000 miles was just replaced. The old filter had missing pieces on the intake side. These were small pieces where the filter is glued to the plastic. I guess they got sucked into the engine and injested. Anyone have this happen before? Seems like a major defect to me. Check your air filters carefully, especially the side on the intake. I will be returning the filter to the manufacture for analysis. Any other suggestions?