I am not very big on dealerships... most only have one guy who works on diesels they tend to pay him poorly..

change the oil put 5000 miles on it pull a an oil sample.. have it analised, if there is fuel in the oil you have an injector stuck open... take a temp gun and check to see if all cyl are heating up the same as it warms up...a cold cyl will show a stuck closed injector..

here is where I go...
Try
http://antrimdiesel.com/