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The problem is the inner turbo seals are bad so it is sucking oil in the exhaust this happens on wide open throttle when you let off it will puff blue. You must replace the turbo or center turbo section CHRA this will be covered under warranty if you are below 100,000 miles. I have replaced the turbo center for this concern and have had it happen again we pulled our hair out for a week turns out the brand new turbo center was bad also. This is 99% of the reason for blue smoke.
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White smoke and runs rough is an injector the smoke will smell like diesel fuel.
White smoke coolant loss is the EGR cooler
Black smoke EGR valve
Blue smoke CHRA
Try a different Ford dealer or just keep bringing it back with the blue smoke complaint they will fix it eventually. It clears up after driving 10 miles or so. Just keep going back and tell them it is the same concern so you don't want to pay your $100 deductible again.
Ok. Thanks again, Shawn.