This is straight from I.H., not sure if it applys to dodges but I'll give you the info anyway. I.H recommends that when using cj4 oil in pre 2007 engines running lsd insted of ulsd to reduce drain intervals by 50% to prevent engine damage.

 

are you talking about the 6.7 or the 5.9

 

It would be the 5.9 that would fall into that catagory. Like I said, this was from I.H. not dodge, so I'm not sure if this affects the cummins, but you powerstroke guys better watch out if you still running the old diesel (offroad diesel)

 

My $0.02 for what its worth. I think the reason is that the higher sulfer content in the LSD fuel will break down the additives in the new oil and thus cause the oil wear out sooner and the need to be changed sooner. To me this is one more reason I will not use the new CJ4 oil until it is proven to protect my engine just as good as the CI4+ can and will.