I have a 2013 Eco with 26,500 on it. I have noticed excessive exhaust for a newer vehicle on a cold startup for a while. A week ago a friend was following me and said he saw a cloud of black exhaust twice. I took it in today and Ford says it's common for direct injection engines to build up carbon. They are going to add a cleaner to the oil. Warm up the engine and then drain followed by an oil change. They have a technical term for the treatment. I guess this is supposed to clean some of that out. They say it's needed every 20-25k miles on these vehicles. Anyone else have any issues with this or anything they have done? I'm worried this is going to cause issues in the long run. Also, I didn't know I had to drop an extra $100 every 20k on this vehicle. If direct injection does this then why make it?