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Old 12-16-2018, 11:25 AM   #1
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Cummins ISL coolant extender

My manual directs me to add coolant extender after 36 months of coolant wear.

Where would one obtain such stuff and what is its purpose?
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Old 12-16-2018, 12:54 PM   #2
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Inhibitor and perhaps other proprietary ingredients and you need to test at least every year with the appropriate test strips for your current antifreeze.
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Old 12-17-2018, 04:52 AM   #3
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OK, am I testing for freeze protection? How much extended do I add and where do I get it.
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Old 12-17-2018, 09:23 AM   #4
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I get my test strips and SCA coolant extender at the local Cummins shop. Start by testing the coolant with the strips. This will tell you if you are within acceptable limits. If out of limits, add one bottle of SCA (Supplemental Coolant Additive) and take a drive. Retest with coolant strips and see if you need to add another bottle.
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Old 12-17-2018, 09:24 AM   #5
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Glycol is usually on the test strip as well. You are looking for the SCA or inhibitor as well. Yearly test for both. You need to know what antifreeze you are dealing with however you can test for Nitrite and Molybdate if the actual type antifreeze is unknow. Assuming you don't already have OAT.
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Old 12-25-2018, 06:32 AM   #6
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I called Spartan, their reply was the extender just adds time (3yr) to the coolant. He did not suggest testing the coolant.
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Old 12-25-2018, 12:44 PM   #7
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I called Spartan, their reply was the extender just adds time (3yr) to the coolant. He did not suggest testing the coolant.
You should definitely test the coolant for the SCA as well as the glycol

To much SCA just adds more TDS and the higher the TDS the higher potential for galvanic corrosion

Most SCA type antifreeze has a recommended 36,000 or three year life as opposed to the OAT which has three or more times the life
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Old 12-25-2018, 03:03 PM   #8
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The Spartan rep asked me what color the coolant is and I told him it was orange. If so he said it was OAT.
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Old 12-26-2018, 11:41 AM   #9
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The Spartan rep asked me what color the coolant is and I told him it was orange. If so he said it was OAT.
There are several orange coolants out there, I use some for my Solstice and it isn't OAT

Dip a test strip and find out for sure
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Old 12-26-2018, 11:48 AM   #10
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So much depends on what coolant you have so you have to establish that first. Most test strips won't tell you the type either. Fluid analysis is the best method. NEVER go by color alone!
Mine is reddish and is a Fleetguard OAT coolant.
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Old 12-26-2018, 12:21 PM   #11
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So much depends on what coolant you have so you have to establish that first.
snip

I had an analysis done a year and a half ago but the report does not indicate the type of coolant.
Attached is the report, can you tell?
Attached Files
File Type: pdf coolant report.pdf (490.6 KB, 9 views)
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Old 12-26-2018, 12:43 PM   #12
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Coolant was replaced in 2015. This is from the work order:
AntiFreeze 50/50 FEXT LIFE DEISEL - 8 GALLONS.
and
CC2825 Coolant ES Complete Fleetguard - 1 gallon.
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Old 12-26-2018, 01:59 PM   #13
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So much depends on what coolant you have so you have to establish that first. Most test strips won't tell you the type either. Fluid analysis is the best method. NEVER go by color alone!
Mine is reddish and is a Fleetguard OAT coolant.
My thoughts were if the test strip shows Nitrite and Molybdate then you know for a fact the coolant isn't OAT

Analysis is certainly the best way to be sure
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Old 12-26-2018, 02:01 PM   #14
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Coolant was replaced in 2015. This is from the work order:
AntiFreeze 50/50 FEXT LIFE DEISEL - 8 GALLONS.
and
CC2825 Coolant ES Complete Fleetguard - 1 gallon.
Well now you know it isn't OAT
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