clong1959 0 Posted January 31, 2010 what brand of engine coolant should i use.plan on changing fluids and flushing radiator soon can u use peak or preston or is there some thing else required. Share this post Link to post Share on other sites
Mopar1973Man 6,132 5 Vehicles Posted January 31, 2010 That's just fine... Most would suggest a pre-mix coolant because it mix with distilled water already. Or you can mix it yourself with distilled water. I've been using Napa, Prestone, Peak what ever is on sale. As for flushing... http://mopar.mopar1973man.com/cummins/general/cooling/cooling.htm Share this post Link to post Share on other sites