CM2250 HIGH coolant and oil Temps

[DVT873]

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BTW: Sad part --- Your story is a weekly event around here. The industry and plague of 'tuning morons' around every street corner willing to take you for a few thousands has literally gotten that bad!
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A question on programming. Asking because I do not know. Have been told that when programming it is "best practice" per Cummins to connect thru the data plug on the engine. Have NOT seen that in writing anywhere. Figure IF that was an issue it would be mentioned here. Also know the most reliable answer will be here.