this is an 07 with no dpf but it might be a good idea to check the air cooler for leaks
was the same scenario with my 07 using about gallon of coolant a day going out the exaust its an egr cooler
wouldnt you get a code if those sensors were working improperly have had codes read twice all is fine there
600,000 miles new turbo,egr cooler,egr valve,oil & fuel filters changed every 15,000 miles hauling a dry van trailer and is making the nose of the...