If it ain't broke, just drive it!!! There were good ones and bad ones. While I don't own one I would not be afraid to buy one. You have spent your money, now educate yourself and be prepared.
I bought an 03' with a 7.3. It has left me stranded twice. Paid for a repair that didn't fix the problem. Went on down the road and had to pay again for the truck to be fixed right. Turned out to be what I told the original mechanic what I thought was wrong with it. This is my first diesel and I had to educate myself. And that information did not come from and RV web site.
My point is, educate yourself about the 6.0 so you will have an idea what it wrong, if something happens. They all have their little quirks.
Good luck, John