I agree with you! I change the oil on my Fiesta's at 5 thousand mile intervals.And decent filters are cheap. A rebuilt engine or more likely sooner needing cam phaser replacement are way more expensive. If the 1.6 had an oil capacity of 6 quarts, than I would say yes, 10 k no problem. But stay away from bargain brand oils! Walmart sells the good stuff like Castrol syntec titanium and Penzoil platinum or even Motocraft semi synthetic oil for very reasonable prices. I also found out that ican get a pretty good deal on Motocraft oil filters from the Ford dealership, if I buy a case of 12. A fairly intensive degree of maintenance is not really very expensive, if you plan for it and buy accordingly.