Ok,,, I have read the postings on filters and oil changes, and received some good information. Anyone know when it would be safe to change to a synthetic oil? Has Ford or International made any suggestions on mileage before switching to a synthetic? I am at 2400 miles on the odometer, and plan on changing oil every 5,000 miles. I like the idea of Motorcraft oil filters and IH fuel filters. One post suggested going with IH 1847170C92 fuel filter kit. IH has a different number for the 6.0. What's the story on that? This is a very good website, and it's nice to have so many people to brain storm with.