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Old 02-09-2007, 02:54 PM   #1
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I was at a Southern Cal Cummins dealer today buying coolent just to top off one maybe 1 1/2 quarts added in the expansion tank they sold me the blue stuff to go with the green that is existing in my system as I left I could see about 8 tech's and mechanics taking a coffee brake all seated at there lunch area They all said yes no problem to mix them so I did it they did not give to much eye contact when adving me to do this so now I'm having second thoughts I will be draining the tank and going to green coolant I've never run the engin after adding the blue mix so it's basicly still in the expansion tank what are you fellow Alpiners thoughts on this
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Old 02-09-2007, 02:54 PM   #2
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Join Date: Feb 2007
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I was at a Southern Cal Cummins dealer today buying coolent just to top off one maybe 1 1/2 quarts added in the expansion tank they sold me the blue stuff to go with the green that is existing in my system as I left I could see about 8 tech's and mechanics taking a coffee brake all seated at there lunch area They all said yes no problem to mix them so I did it they did not give to much eye contact when adving me to do this so now I'm having second thoughts I will be draining the tank and going to green coolant I've never run the engin after adding the blue mix so it's basicly still in the expansion tank what are you fellow Alpiners thoughts on this
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Old 02-09-2007, 03:37 PM   #3
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Technically the blue stuff is compatible with the green. The green coolant that you are using is Fleetguard Universal EG, which is an Ethylene Glycol based coolant designed for heavy duty applications. However, it's a not a long life coolant. The blue stuff that was added is Fleetguard ES Compleat EG, which is an extended life coolant. Unlike the pink Fleetcool (extended life) or the green Universal coolants, the blue ES Compleat has a different makeup of silicate reducing additives and replaces boron and some other silicates with some other additives. I don't have access to my notes but there were three major components that were replaced. Technically, Compleat does mix with the other coolants but your additives won't get along all that great and you'll have to pay very careful attention to your chemical makeup by using the test strips frequently to prevent liner pitting. For more details on diesel engine coolants I'd recommend you visit the RV Tech Library. Check out the Diesel Engine Coolants page and follow some of the links.

Finally, if you are going to dump the stuff and replace it, which is probably about due anyway, I'd seriously consider going with the Fleetguard Optimax coolant. This stuff is red-orange, yet another color , but it is the best thing on the market. It's an Organic Acid Technology (OAT) coolant. OAT coolants do not require checking of SCA levels because OAT based coolants use organic acids, which don't have any liner pitting tendancies to worry about. Plus the organic acids don't eat aluminum like all the other coolants do so you'll get less corrosion in aluminum engine parts and radiators. They are good for 6 years or 600,000 miles and only require adding an extender at 3 years or 300,000 miles to accomplish that. It's the best coolant you can get for your coach and it's made by Fleetguard, which is a division of Cummins so it's available at any place that services Cummins. Plus Optimax is certified for virtually everything from your Prevost to a water cooled lawnmower. I'm running it in my Cummins ISL and as soon as winter leaves I'm converting my Onan genset over to it too.
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