Took my truck in yesterday to get the last warranty work done. My truck is a 2011 f150 4x4 FX4 with the 5.0 coyote motor and the truck has 35820 miles on it. The reason I took it in was the motor would have a like lifter tick that would come and go. Well they told me they looked at the motor and it is sludged up and don't think they can warranty the problem because it is sludged up now I change the oil between 5000 and 8000 miles on that truck and I work on cars and build cars all the time and have been for over 25 years and am retired from ford motor co. When I asked to see the truck and motor they said it's in back and I said I like to see the inside of motor because the valve cover or what they took off to determine this should be off they said they did not take anything off to determine it so I asked how the hell did they come to this and he said he will have to talk to his service manager to see what can be done and avoided my question completely. Anyone else have this issue when taking there truck in for service.