Again why would anyone use an oil filter for more than the manufacturers warranty. P-1 is only warranted for 3000 miles. Lets spend the money for a high mileage filter. Each company spends considerable amount of time and money performing R&D on the filters. If the P-1 could last 10,000 miles it would be rated to that amount. He bought an expensive car and expensive oil and then takes a chance on a $5.00 filter to last 7,500-15,000 miles? A M-1 is 10 bucks and rated for 15,000 miles. Bosch,and Mobil 1 are over 99% efficient. I'm with you, change the filter! Filters are not that reliable and have had a few failures from them in my past. Try collecting on claim if we go past your warranty on the filter. The doubters will need a good lawyer and lots of money.