In May of 02 my wife and I bought an 03 Subaru Forester and in March of 03 we bought an 03 Ford Ranger. The Forester owner's manual recommended a 7,500 mi. oil change and the Ranger owner's manual recommended a 5,000 mile oil change. I figured that if I could go those distances with dino oil I could go 10,000 miles on each with Mobil 1. Since I do whatever maintenance I can and take good care of my vehicles (and swear by the informative power of the internet) I did a lot of research on oil, OCI's, oil filters, etc. I gave the most credence to info and opinions from neutral sources. I learned a lot, including that the 3 yr./3,000 mi. OCI is a thing of the past. So I switched to Mobil 1 at 9,000 mi. on the Ranger (I just changed the Mobil 1 at 19,000 mi.) and at 26,000 mi. on the Forester (I'll also change the Mobil 1 every 10,000 mi. in the Forester). It didn't bother me a bit to go to synthetic oil and 10,000 mi. OCI's.
I'm also changing the oil filters every 10,000 mi., when I change the oil. My research told me that the following oil filters are all good: AC Delco Duraguard, AC Delco Ultraguard Gold, Mobil 1, Motorcraft, Purolator Premium Plus, Purolator Pure One, and Wix. A year and a half ago I bought a few of each of the Purolators, enough to last me 3-5 years on each vehicle at the rate we drive.