Potassium levels going up but no sodium
I have a 2012 cummins isx with 118000 kms on it and every sample I've taken shows 19 ppm increase in my oil of potassium in each sample but no sodium. My tbn numbers are holding and everything else looks good. Was wondering if this could be coolant intrusion or if not what else. I have never used any coolant that I can notice.
Is this a good question?