ronandsue74 Report post Posted February 5, 2017 I will soon drain & replace the coolant in my 2005 CC Inspire with the Cat C-9 Engine. Six years ago I replaced the original green coolant with Peak Final Charge 50/50 OAT technology. While price shopping I have noticed that the Peak Final Charge is available in two a versions, Nitrate free and one that does not state it's nitrate free. However, the one that does not claim to be nitrate free says it Cat approved. Can someone explain the differences advantages/disadvantages of each. Thank you Ron Jacobs Share this post Link to post Share on other sites
