You can get the official manual here:
http://www.ramtrucks.com/en/owners/manuals/
Then choose the diesel supplement option. You'll see they have a chart.
From manual:
So, basically it could go up to 10K miles, and as little as 3500 miles.
Welcome to the site!
That was my first impression. But, if they are draining non-sold trucks oil and replacing it with the new spec that really takes away from the "cost saving" theory.
Welcome! Keep in mind a lift will hurt your MPG, I know most people don't like the idea of losing MPG when the #1 selling point of the EcoDiesel is fuel mileage in a full size truck.