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Old 10-14-2020, 04:15 PM   #1
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Join Date: Oct 2015
Posts: 853
Did I screw up......engine coolant?

I have a Cummins ISB 6.7L engine in my 2013 Fleetwood Excursion. Is this a wet sleeve engine by the way?

Pics of coolant in question below.

Anyway, I had my cooling system flushed and refilled a couple of years ago at a Freightliner shop. They used Fleetcool EX CC2746, 15 gallons.

I have a coolant leak (now fixed), rig did an auto shutdown due to low coolant. I drive to the Freightliner shop and they don't have the Fleetcool EX CC2746 as described above and instead point me to Detroit PowerCool Plus Extended Life OAT Diesel engine coolant. CumminsCare site says coolant for my engine should meet spec CES 14603, which this coolant does per the label on the back of the jug. I put in 1.5 gallons of this coolant into my system to top it off.

Later I talk to Cummins tech support, they say nope, shouldn't have mixed the Fleetcool EX with the Detroit PowerCool OAT because the PowerCool is an OAT coolant. Can mix OAT coolant with the Fleetguard coolant because of problems with corrosion inhibitors or words to that effect. He says I should be OK as long as I didn't exceed 20% of my coolant capacity with the Detroit PowerCool OAT liquid, but this mix isn't ideal. I put 1.5 gallons into a 15 gallon system so I haven't exceeded the ratio.

OK, so now I'm a little nervous. I call Freightliner and look into having the cooling system flushed. Not cheap. They say waste of money, they mix these two coolants all the time no problem. I go on to a FaceBook forum and start Googling. I read things like "gelling could occur" and "severe engine damage" by mixing this OAT coolant with "old coolant" but opinions seem to vary.

Freightliner and Cummins seem to think I am OK, but am wondering what the forum thinks? A coolant flush will likely cost me 500 bucks, but obviously that's cheaper than ruining an engine.
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2013 Fleetwood Excursion 33A
Cummins ISB 6.7L (ISB 10)/Allison 2100 Transmission
Freightliner XCS chassis
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Old 10-14-2020, 04:19 PM   #2
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Posts: 530
The 6.7 is not a wet sleeve engine. You should flush the system and refill. I have seen them gel it is not pretty.

Originally I thought you were saying they are both OAT but I now see they are not.
2015 Winnebago Tour 42QD
Cummins 8.9 ISL 450
Freightliner XCL W/IFS
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Old 10-16-2020, 03:08 PM   #3
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To tie a ribbon around this thread in case anyone else has a similar problem, another forum sent me the attached Fleetguard technical bulletin. In it, the following is stated:

Fleetguard coolant additives and coolant products are fully compatible with all known competitive products . Our coolants, whether conventional SCA or OAT (organic acid technology) inhibited, are compatible with each other as well as the various conventional and OAT coolants of other manufacturers

I guess I feel a lot more comfortable about the mixing now, however I am still not going to purposely do it.
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2013 Fleetwood Excursion 33A
Cummins ISB 6.7L (ISB 10)/Allison 2100 Transmission
Freightliner XCS chassis
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scr, engine

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