It is a 6.0 with 65,000 miles on it and I took it to a dealership a couple of hours from home. They replaced the EGR valve, changed the oil and filters andd serviced the transmission and sent me on my way. It ran good for 1200 hundred miles and now I have no power again and black smoke coming out of the tailpipe. I had it towed to a different dealership closer to my house. Service manager called me today requesting permission to do a tear down to check the EGR Cooler. He then said Ford Warranty inspector is going to come inspect it on Monday to determine if I have taken care of my truck and if I have modified it. My truck has no engine modifications and I have regularly serviced it. Luckily I had the oil and filters changed by the other dealership when the EGR valve was changed. Hopefully the Ford Warrant inspector will approve the repair since I paid $4,000.00 for the extended warranty when I bought the truck new. The service manager told me Ford sends out a Warranty Inspector anytime the warranty repair is over $2,000.00. Has anybody else been through this? Do I need to worry?