2017 x15 Coolant system pressure test. Not losing pressure after 20 minutes ??

[tree98]

X15 doesn't use a crankcase filter, it's got some other new fangled system on it that cummins says never needs to be serviced

Your posts are quite confusing. Now you say your losing coolant when you pressure test, before you said it wasn't losing any pressure at all when you pressure test, which is it? And are you doing the test correctly??

If your getting excess pressure in your cooling system it could be combustion gases from a dropped liner.

If you have established that your losing coolant and its not an external leak, the only thing left is either your burning it or its going into the oil. You could drop the dpf and easily tell if your burning it.

To check for a dropped liner you'll need to pressure test it overnight with the oil pan off then slowly turn the engine by hand and look up at the bottom of the liners for drops of coolant, most likely #5 or #6.