First a little background on my truck. 2006 F-350 6.0 PSD that will be 6 years old this September. 96,000 mile on the odo (2600+ hours on the engine) and the truck is stock except for a Magnaflow turbo back exhaust(lost the cat),FS2500 Oil Bypass Filter,DieselSite coolant and tranny filter kits, and a few other items. Truck is used daily and has towed some various loads, and has been trouble free. Operated mostly in Northern Nevada where the weather can be extreme(-20 F to 100+).I do all my own maintenance. Here are my recomendations. Use a synthetic such as Rotella T6 5w-40 or Mobil 1 TDT. I use the Rotella myself, and both are readily available. HEUI injectors like the synthetic when it is cold. Use Racor (OEM supplier)or Motorcraft filters only for the oil and fuel system, Donaldson (OEM supplier)or Motorcraft air filters. I would not exceed the 7500 oil change interval as the HPOP (High Pressure Oil Pump)will shear the oil to about a 30w at 5K. I change my oil at the 5K interval. Change fuel filters at 20k if you can get fresh clean diesel fuel, otherwise you will have to change them more often. Fuel supply is crucial for injector life. Treat the diesel fuel with Stanadyne Performance Formula or another high quality fuel treatment that acts as a water de-mulsifier, improves lubrication, and boosts cetane. Fuel treatment helps with keeping the EGR system clean. Avoid excessive idle time with this engine...bad for EGR system. Maintenance is crucial on these engines and there is no cheap way around that fact. If you skimp on maintenance you will probably suffer for it. And get a good set of guages or a monitor of some type to watch the Engine coolant temp, Engine oil temp,Exhaust gas temp (EGT),and Fuel Pressure. Get a coolant filter installed and now is the time to do a coolant flush...ignore the recommended 100k change interval. Any questions just ask.