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Re: Coolant change time or mileage [Re: kschachn] #4883370 09/29/18 10:48 PM
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Onetor Online Content
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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.


I stand corrected. Ty


N = R* x fp x ne x fl x fi x fc x L
Re: Coolant change time or mileage [Re: motor_oil_madman] #4884647 10/01/18 03:01 PM
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I do radiator spill/fill's at 1/2 the allowable intervals that way the coolant in the system is always fresh all the time and there is no need for flush/fill. I have driven all my vehicles to their junk points with original water pumps and radiators.


'18 Caravan - 42k KM - AMSOIL SS 0w20, Fram Ultra, TC-W3 500:1
'06 Santa Fe - 535k KM (Retired)

There is no such thing as "lifetime" fluids! mad
Re: Coolant change time or mileage [Re: motor_oil_madman] #4891612 10/09/18 07:01 AM
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mcrn Offline
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I just went 6 yrs on my nissan with 75k miles....makes me feel bad I waited a yr too long,


2012 Nissan Rogue
Re: Coolant change time or mileage [Re: motor_oil_madman] #4908908 10/29/18 04:39 AM
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demarpaint Offline
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I go by time for the coolant. I'd never hit the mileage stated in the owners manual vs. the time in use for the coolant.


God Bless Our Troops

Re: Coolant change time or mileage [Re: motor_oil_madman] #5007523 02/11/19 12:05 AM
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KevinP Offline
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There are two concerns, coolant degradation as it acidifies with age, and inhibitor package depletion.

You can check how the glycol is aging with a pH meter (strips won't give you enough resolution). You should make sure your pH meter is calibrated against pH buffer standards because the probes quickly drift out of calibration, especially when they are not stored correctly. The pH should be around 8.0 in a healthy glycol solution for automotive use. And yes.... it ages quicker with heat. The degradation is a chemical reaction and ethylene glycol primarily degrades into glycolic acid (some oxalic, some formic) and all chemical reactions proceed quicker with energy input. Thus ethylene degrades into the acids quicker at higher temps than it would at lower.

I've also seen studies that show inhibitor degradation over time. The azoles, in particular, drop with time. I'm not sure of the mechanism whether it is bonded to copper/brass as the inhibiting layer or if it is lost in the non-sealed system. Either way, you could just start at a higher level. The assumption is that it will be run at 50/50 so run it at 65/35 so you have more to start with.

It is so cheap to dump it on a regular basis that I err on the side of caution.

Re: Coolant change time or mileage [Re: motor_oil_madman] #5130985 06/11/19 01:50 AM
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tiger862 Offline
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Thermostat and coolant every 5 years. Gives system a good drain and when bleeding the system out less chance of thermostat getting stuck.


Tiger862
2018 Grand Caravan
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