I think the problem is with service intervals. I change my oil and do an oil flush every 6,000 odd kms and never the ford recommended 10,000+. My car did over 240,000 with the factory filter before I changed it to a new factory replacement filter only because of new tune witb more boost was being done and I found this to be cheap insurance. My car had been previously tuned for several years prior to that. Theres two schools of though 1) to change to an after market filter and 2) to replace with a factory filter...both have merits......do whatever makes you sleep well at night