Did my first oil change today at 2100 miles. Oil looked very dark. Didn't see any metal filings on the pan plug magnet. I asked a dealer service rep about the color and he said Ford uses a synthetic blend at the factory and it was normal for it to look like that. I put in a fully synthetic, Mobil 1, 5W20 weight. $5.25/qt. at Walmart and used a motorcraft filter from the dealership. I would have used a Wix, but NAPA didn't have one for an 06'. I'm sure the 05' filter would be the same.