one thing you MUST do that the dealer's hardly ever know to do, is get a proper diesel specific synthetic oil in there, with an API rating of CH-4 or even better, CI-4, the new rating for synthetic diesel oils made for engines with EGR systems, which the 606 engine has.
I've run Amsoil's Series 3000 Heavy duty diesel oil 5w-30 and currently run Mobil Delvac1 5w-40, both with excellent results. These would be considered the two top of the line diesel oils. I switched to Delvac because I moved to florida, and like the extra protection of the 40 weight oil, and because my TDI requires 5w-40 as well, and wanted to just buy one kind of oil. Delvac can be purchased online at
www.avlube.com if you can't find it locally. Its usually hard to find, do not mistake it for the crappy dino oil, delvac 1300.
Don't forget to change the prefilter and o-ring when you change the fuel filter.
Listen to hear if your engine is knocking excessively at idle. Mine was, it had bad injectors, all replaced at 31k. Scary how quiet it is now.
Run additives in each tank, preferably stanadyne peformance formula, or powerservice in a pinch(white bottle winter, silver, summer).
Good luck!