From what I read on other forums this has been a common problem with the v8 diesel and more than a few motors have been wrecked by owners that did not check there oil level on a regular basis. Just make sure you don't let it get to low and discus it with your mechanic at the next service.
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In life it is important to know when to stop arguing with people
and simply let them be wrong.
You will have the 1HD-FTE 6 cylinder turbocharged engine. Your best bet is to go to http://www.lcool.org/index.html then have a look around and join the forum to ask your question from those who have been there before. They are a great group and very helpful.