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Coolant change time or mileage #4663411 02/11/18 11:40 PM
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motor_oil_madman Offline OP
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I don't reach the 100,000 mile mark before 5 years. Is the pink mopar HOAT coolant done after 5 years? I changed it initially around 5 years and like 83,000 miles. I'm at 10 years and 123,000 now.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Coolant change time or mileage [Re: motor_oil_madman] #4663440 02/12/18 12:22 AM
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Generally long life coolant is good for 5 years. I figure coolant is more sensitive to time than miles per se.


2007 Jeep Liberty PP 0w-20 / Carquest Blue, 6k oci
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Re: Coolant change time or mileage [Re: motor_oil_madman] #4663472 02/12/18 02:02 AM
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I changed the factory fill orange G05 HOAT in my 2012 Ram last year when I hit the 5 year mark. I had 46K miles on the truck at that time. I want this truck to last and the price of Zerex G05 at AAP after discount code (when not on some lousy $2 off a gallon sale) isn't prohibitive IMO. I did not do any analysis on my used coolant.

I found the Mopar HOAT MS-9769 pricing to be significantly higher than Zerex G05 so I went with Zerex. It's a light gold / yellow dyed coolant but also MS-9769.

Personally I think hot weather driving in Texas beats up coolant chemistry worse / faster than cold weather driving in more northern climates. The good old Arrehnius equation.


"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen
Re: Coolant change time or mileage [Re: motor_oil_madman] #4663475 02/12/18 02:16 AM
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Valvoline told me the life of coolant in the bottle is also 5 years.

It's a good idea to check the date code through your smartphone when picking up coolant in store.


It ain't what you don't know that gets you into trouble. It's what you know for sure that ain't so.

- mistakenly attributed to Mark Twain
Re: Coolant change time or mileage [Re: motor_oil_madman] #4663476 02/12/18 02:48 AM
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Nyogtha Offline
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The PI sheet for Zerex G05 shows a shelf life of 3 years.


https://sharena21.springcm.com/Public/Do...12-ac162d889bd1

So I always check the date code and I don't stock up too early.


"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen
Re: Coolant change time or mileage [Re: motor_oil_madman] #4663659 02/12/18 10:20 AM
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motor_oil_madman Offline OP
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I notice the thermostat starts getting laggy after 5 years or so. Gets slow to warm up.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Coolant change time or mileage [Re: motor_oil_madman] #4663759 02/12/18 11:40 AM
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Every 5 years and you won’t have problems.


If you want the job done right......do it yourself.
Re: Coolant change time or mileage [Re: motor_oil_madman] #4663832 02/12/18 12:35 PM
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The_Nuke Offline
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Originally Posted By: motor_oil_madman
I don't reach the 100,000 mile mark before 5 years. Is the pink mopar HOAT coolant done after 5 years? I changed it initially around 5 years and like 83,000 miles. I'm at 10 years and 123,000 now.


IMO it is best to treat the coolant life expectancy claims like the manufacturers treat their new car warranties - xx miles/x years, whichever comes first. So if the coolant sees its 5th birthday before it sees its 100,000th mile, change it.

Allowing it to go beyond 5 years in order to reach the 100K mile mark is a recipe for disaster IMO, especially considering the severe operating environment your geographical location imposes.

(My position on this subject was recently bolstered by personal experience with factory fill Mopar HOAT coolant that was allowed to go beyond the 5 year mark even though it had not yet been in service 100K miles. There were clumps of brown goo left behind in the overflow tank and what looked like sand particles filtered out of the drained coolant when transferring from drain pan to collection jug.)


2012 Charger Pursuit aka "The Bacon Hauler"
- 5.7L + NAG1 (A5) + 3.07 (215mm)
Re: Coolant change time or mileage [Re: motor_oil_madman] #4863874 09/08/18 10:43 PM
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Onetor Offline
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Don't forget that coolant also lubricates the Water Pump etc. So the additives need to be replenished, etc. I agree about the heat being detrimental!


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Re: Coolant change time or mileage [Re: Nyogtha] #4870402 09/16/18 06:14 PM
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Originally Posted by Nyogtha
The PI sheet for Zerex G05 shows a shelf life of 3 years.


https://sharena21.springcm.com/Publ...bd3/c264d227-0dbd-e711-9c12-ac162d889bd1

So I always check the date code and I don't stock up too early.
Where does it show the shelf life?


2015 F150 2.7
2018 F350 6.2
Re: Coolant change time or mileage [Re: motor_oil_madman] #4874274 09/21/18 01:25 AM
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For me 5 years is a dream, because of the previous owner's neglect the coolant starts to turn brown after a few months on my Escort .


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Whatever keeps the lifters quiet...

Re: Coolant change time or mileage [Re: motor_oil_madman] #4874686 09/21/18 12:30 PM
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Kira Offline
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To Onetor and others:

I also believed in lubricating the water pump's bearings as an obvious necessity but was told the designs of modern water pumps is such that the bearings are isolated and coolant (or any lube you put into coolant) never touches them.

Lubricating them is impossible, they implied.

I grew up adding water pump lube to anything which had one.......I wonder if both old and new designs exist.

Re: Coolant change time or mileage [Re: Onetor] #4874721 09/21/18 12:51 PM
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Originally Posted by Onetor
Don't forget that coolant also lubricates the Water Pump etc. So the additives need to be replenished, etc. I agree about the heat being detrimental!

Which parts are lubricated by the coolant? The water pump bearings are actually protected from the coolant by seals. Once the seal deteriorates and is breached by the coolant the bearings will destruct in short order.


1994 BMW 530i, 252K
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Re: Coolant change time or mileage [Re: kschachn] #4879505 09/26/18 04:55 AM
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Originally Posted by kschachn
Originally Posted by Onetor
Don't forget that coolant also lubricates the Water Pump etc. So the additives need to be replenished, etc. I agree about the heat being detrimental!

Which parts are lubricated by the coolant? The water pump bearings are actually protected from the coolant by seals. Once the seal deteriorates and is breached by the coolant the bearings will destruct in short order.

Correct. The pump bearings are behind a seal.


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Re: Coolant change time or mileage [Re: motor_oil_madman] #4879866 09/26/18 12:55 PM
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Wait till you get some of that lubricating coolant on any accessory drives like we have in our service vans. If the tensioners and/or idlers get any real penetration by the coolant it's time for replacement in short order.


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