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Old 08-29-2020, 11:38 AM   #1
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Talking Coolant Recommendations Please

Looking for recommendations re: CAT diesel 3126B engine coolant please.
1999 National Tradewinds 7372 Allison 6 CAT 3126
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Old 08-29-2020, 11:47 AM   #2
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The preferred coolant (by CAT) is the Extended Life Coolant (ELC). It is a red color. No SCA is needed with this coolant.

The coolant that came in your Coach was ethylene glycol (green) and required a Supplemental Coolant Additive (SCA). There is nothing wrong with this coolant but you have to test the SCA level annually (there are test strips) and add SCA if the levels are low.

The two types are not compatible (can't be mixed), so if you want to switch to ELC you need to flush the cooling system until water runs clear, then you can put in ELC.
Mike ----- 2005 Beaver Patriot Thunder CAT C13 525HP, 42-ft Tag, with HydraLift -----
*SMC-Bvr-Mnco History/Chassis Info https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
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Old 08-29-2020, 06:53 PM   #3
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How old is the coach? If the coolant is OEM, call the chassis manufacturer, they put in the coolant.
2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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Old 08-29-2020, 07:00 PM   #4
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Originally Posted by Cat320 View Post
How old is the coach? If the coolant is OEM, call the chassis manufacturer, they put in the coolant.

Although Caterpillar recommends OAT Coolant, Freightliner, who adds the radiator and front dashboard heat coils does not. From what I was told, Freightliner installed some sensors that are not compatible with OAT Coolant.
Good Luck, Be Safe and Above All, Don't Forget To Have Fun
Central Kentucky
2006 Fleetwood Discovery 35H, 2014 Honda CR-V, M&G Engineering Braking System
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Old 08-30-2020, 11:58 AM   #5
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Thanks for all the info!

Thank you everyone! You provided us with great information - sending us to the Net to search out more info. Certainly enough to know that the coolant in there now (which is a very weak green color) will be flushed out and replaced. We have a CAT dealer close by that we'll be contacting on Monday to discuss their coolant and have located Rotella ELC also.
Thanks for all your support and info as we wade into the mechanical side of our new to us coach!
1999 National Tradewinds 7372 Allison 6 CAT 3126
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Old 08-31-2020, 09:33 PM   #6
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Just last week I was at my local Freightliner parts counter. I needed to replace my original Freightliner made surge tank on my 2004 Topical Cat C7 and decided to also replace all the coolant.

The original Factory coolant, according to the sticker, was an Alliance Formula with Freightliner spec 48-25134-001. The parts counter gave me Detroit Diesel Power Cool Plus 50/50 Gallon Nitrite Free Extended Life Coolant - OWI 23519396.

I questioned this and they reassured me that this what Freightliner uses. Well 9 gallons at $7.25 each went in and promptly took a 300 mile round trip on mountain climbs and everything seems to be cooling well. I hope it is all good in the long run.
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