DEF Reliability

It's better than 07 engines. DEF lowers exhaust temp and makes stack remain chrome.

 

I think there is some confusion between DPF and DEF going on here. DEF has nothing to do with regens or exhaust and stack temps. That is the DPF. DEF just shoots panther piss in the exhaust stream to reduce NOx. Now, it is true, that since DEF came on board, the OEM's have been able to reduce the amount of EGR to the engine, that has had a reduction in soot levels in the exhaust and resulted in fewer regens by the DPF's.

 

That's what i heard from rumors. DEF dd15 became better than 07 dd15. Detroit is now the best scr engines out there. screw carb and epa.

 

DEF made a lot of issues much better! But it has some issues that can happen, biggest one is growing crystals. Keeping the DEF tank as near full at all times prevents this. As it dries it forms a white crystal. A half full tank , the fluid may splash up and hit the top of the tank once or twice a day , then dry. A full tank the top of the tank will be splashed nonstop . So it never dries. Before topping off DEF , wipe the end of the handle down. Keep any crystal on it out of your tank. My truck has been trouble free so far at 429,000 miles.
Some of ours have been having issues , and talking to them , they have not been keeping the DEF full. As I talk to them they are going to start topping off each time they fuel. Time will tell if it's a cure?

 

I drive a 03, but have seen the white crystal on the shop floor.

 

Those crystals are stopping up the plumbing. Pump is covered with them at the truck stop. So it clings long to stay there and dry.

 

One problem that we found on the def trucks is if you don't change the inline air filter that goes to the dosing pump it can block and create a vacuum in the dosing pump, and the adblue will crystalize in the pump and stuff it.
Other than that and a few sensor issues are the only problems we have found.