I use Delo 400 15w-40, and fleetguard filters. I buy oil and fuel filters from Genos Garage, online, a dozen of each at time. Change both every 5000 miles. 2006 with 255,000 on it.....original fuel pump and injectors, getting 18 mpg. I had 502,000 on my 1991 Dodge, when I sold it, and it was still a solid truck.
I add diesel kleen fuel additive at every fill up, and plug the block heater in, when it gets below 40f. I'm sure both adds life to the engine....
Andy3
