Truck Repair: n14 cummins, n14 cummins, engine coolant

Question
I have a 2000 n-14 Cummins eng.I would like to know what type of engine coolant it uses? I think I was using 50/50 extended life orange.now all I see in stores is the extended life red.can I mix the two.or just flush and refill? wich is want I want to do.would that be ok.1,000,000 miles.what do you recomend? thanks

Answer
There are different types and coloured coolant available in the market globally. Cummins recommend using either a 50/50 mixture of good quality water or fully formulated coolant. The fully formulated coolant must meet TMC RP 329 or  TMC RP 330 specification.


Regards,