Hopefully your contact can clarify this for all of the misinformed. I can state unequivocally, that in 2001 when "long life coolants" were finding applications in the Class 8 diesel engine field, the Cummins Southern Plains field training manager said the factory fill long life coolant was causing problems with oil coolers and wet cylinder liner "O" ring seals in Cummins ISX and N-14 engines. However..... these apparent coolant related problems have been rectified and factory fill oxalic acid based "long life coolant" is the standard factory fill for all Paccar vehicles. Another case of technology (chemistry) getting ahead of itself. Let no good deed go unpunished!!