My/17 build, had CAM phasers replaced twice. 1st time at 27,000 and 2nd time at 33,000. No mods. st time 24 days in the shop 2nd time 4 days. I made sure they had the parts and the tech was ready for it the 2nd time. This time I got Ford CS involved and the contacted the dealership. they really stayed on top of it.