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Old 04-20-2019, 01:16 PM   #1
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Coolant mix

Just did a full-on flush-n-fill of my coolant system. While I was at it I replaced the water pump, tensioner arm, belt, thermostat and cap. The hoses looked good but I may keep some spares on hand.

Anyway.

This is the first time I've used concentrated antifreeze and I was wanting to be sure I have the mix at 50/50. The Prestone tester I have doesn't specifically call out a 50/50 mix but I did sample some Prestone premix that I keep on hand for my Honda just to see where the needle fell.

From what i can tell, my mix (the last picture) is maybe just a little low on coolant.

Does that seem right?
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Old 04-20-2019, 03:31 PM   #2
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Did you run the engine with the new mix to get it all to thoroughly stir? I honestly wouldn’t worry too much but looks like you’re fine.
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Old 04-20-2019, 03:55 PM   #3
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Did you run the engine with the new mix to get it all to thoroughly stir?
Yeah - about 30 minutes or so, then let it cool down and then another 20 or so.
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Old 04-20-2019, 04:01 PM   #4
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What RV and engine do you have? What coolant did you use?
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Old 04-20-2019, 04:49 PM   #5
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What RV and engine do you have? What coolant did you use?
Tiffin on a Freightliner. Cummins 6.7L ISB. Peak Final Charge.
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Old 04-20-2019, 05:06 PM   #6
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OK, that engine doesn't have wet liners so SCA's aren't required but doesn't hurt to have them.
And yes it does look like you need a little more concentrate.
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Old 04-20-2019, 05:43 PM   #7
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Just something to think about. I realize that the automotive and I assume trucking industry has been saying to use a 50/50 mix of antifreeze for decades, frankly as long as I can remember. However what doesn't seem to be commonly recognized is that that is not necessarily the optimum mix for cooling and freeze protection. Ethylene-glycol's best freeze and boiling protection is at about a 70% solution. I used to approximate this by mixing my coolant in a bucket prior to putting it in my car. 2 gallons of antifreeze to one gallon of water which was close enough to 70% for me. From the Peak website it looks like this is still a good mixture.


https://www.peakhd.com/wp-content/up...319.pdf?x38462


Just something to keep you a little cooler on those long climbs.
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Old 04-20-2019, 06:22 PM   #8
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Water conducts heat away and gives up its heat better , 50/50 became standard best of both worlds.
https://www.hotrod.com/articles/glyc...water-coolant/
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Old 04-20-2019, 08:31 PM   #9
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OK, that engine doesn't have wet liners so SCA's aren't required but doesn't hurt to have them.
That was pretty much my logic as well. Not necessary but not harmful, either. The life-span and good reputation of Final Charge were my primary considerations.
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Old 04-20-2019, 09:50 PM   #10
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OK, that engine doesn't have wet liners so SCA's aren't required but doesn't hurt to have them.
And yes it does look like you need a little more concentrate.
Lots of stickers on my 6.7 ISB 340 about SCA's, testing procedures in the book etc etc.....
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Old 04-20-2019, 10:07 PM   #11
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Lots of stickers on my 6.7 ISB 340 about SCA's, testing procedures in the book etc etc.....
An idea when Cummins decided to change that? First I've seen of that. I know my previous ISC and present ISX require them, although I use OAT coolant
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Old 04-21-2019, 01:58 AM   #12
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An idea when Cummins decided to change that? First I've seen of that. I know my previous ISC and present ISX require them, although I use OAT coolant
No idea.... just following the instructions. As you said, it certainly can't hurt.
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Old 04-21-2019, 06:45 AM   #13
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Are there any threads y’all know of, of any pushers overheating or freezing do to improper products or mixtures?
Seems to me that most of our attention should be focused on lubrication, air filtration and fuel filtration.
Every diesel truck I’ve ever owned, The only thing: I ever worry about is, is it at the right level, is it leaking, and is anything mixing with it, ie, fuel, oil, or exhaust.
If you really want to know where your coolant should be, do the research on your specific engine and use a refractometer to be sure you’re where you’re supposed to be. If you’re willing to go that extra mile, you should do the same with testing your aqua hot coolant, and generator coolant as well.
Most shops would only ever use a refractometer if the coolant looked suspicious, but usually never check again once they refill.
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