I have a 2006 2500 with the Cummins diesel. I have a friend with basically the same truck, a 2003 model. My truck has 4500 miles on it. I changed the oil at 3000 miles because it was very black. I checked the new oil with 1500 miles on it and it is black again. My friend has
43000 miles on his and it is never dirty at 5000 mile change intervals.I am new to diesels and have heard that fuel in the oil will cause this. I'm having it looked at by a dealer who tells me that's just how diesels are. Should I believe him? Any and all advice appreciated. The truck runs great and is getting 17+ mpg mixed city and highway driving.
I have also had trouble starting it intermittently. I've noticed the "glow pulg" light on the dash doesn't always come on when the temperature out side is in the 50's (i think the grid or whatever is supposed to come on somewhere below 60 deg.) I can't say I've noticed it relating to the hard start problem. Thanks!