UOA results @ 349k
Comments — “While the potassium and sodium could show coolant seeping into the oil, the WVO you’re running as fuel may also be to blame. Since wear is reading normally, as long as you don’t notice any lost coolant or increased oil on the dipstick we aren’t going to consider potassium and sodium a problem. You noted an increased cost for Motorcraft oil, and we won’t expect to see any change in wear if you switch to Shell Rotella T. In fact, many Power Stroke owners have had great success running that oil type. The TBN was strong at 7.6. Try up to 8,000 miles next.”
