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Coolant Question - Can it degrade or go bad? #4704393
03/23/18 03:12 PM
03/23/18 03:12 PM
Joined: Dec 2016
Posts: 2,259
MURICA
maverickfhs Offline OP
maverickfhs  Offline OP
Joined: Dec 2016
Posts: 2,259
MURICA
I have quite a few coolants laying around, some of them are sealed and some are open.

Was wondering if can go bad after some time or have some expiration? Understand, it's NOT milk. wink

But still wanted to verify with pro's Thank you thumbsup


2006 Civic EX 205K/AT
2006 Acura TSX 187K/AT
Re: Coolant Question - Can it degrade or go bad? [Re: maverickfhs] #4704411
03/23/18 03:28 PM
03/23/18 03:28 PM
Joined: Dec 2002
Posts: 41,966
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 41,966
'Stralia
I can't see them going bad in sealed unopened containers.

Re: Coolant Question - Can it degrade or go bad? [Re: maverickfhs] #4704907
03/24/18 06:01 AM
03/24/18 06:01 AM
Joined: Dec 2016
Posts: 7,481
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,481
Waco, TX
It never goes bad.

I have drained "near-new coolant" from rusty systems, let the crud settle down, and put it right back in another system.

Coolant never "wears out" - Several engine manufacturers suggest doing an analysis to see which additives are depleted (similar to a UOA) and the additives can be bought separately in small bottles to add to the coolant to replenish it.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Coolant Question - Can it degrade or go bad? [Re: maverickfhs] #4704957
03/24/18 06:54 AM
03/24/18 06:54 AM
Joined: Nov 2006
Posts: 20,779
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,779
MA, Mittelfranken.de
I read a long time ago that its the heating and cooling cycles that cause the additives to deteriorate, it sounds reasonable but I have no idea how true it is.


ASE L1, Master. Deutsch Meisterbrief.
Re: Coolant Question - Can it degrade or go bad? [Re: Trav] #4705061
03/24/18 08:41 AM
03/24/18 08:41 AM
Joined: Dec 2013
Posts: 3,989
Manchester, England
Olas Offline
Olas  Offline
Joined: Dec 2013
Posts: 3,989
Manchester, England
It sounds reasonable from a chemical POV but sounds like a bad choice of material for a system that is designed to see heat cycles..


Cable ties should hold it
Re: Coolant Question - Can it degrade or go bad? [Re: maverickfhs] #4705062
03/24/18 08:42 AM
03/24/18 08:42 AM
Joined: Dec 2016
Posts: 2,259
MURICA
maverickfhs Offline OP
maverickfhs  Offline OP
Joined: Dec 2016
Posts: 2,259
MURICA
So does it mean it'll go bad in 'opened' bottles and should be good in sealed bottles?

Thank you all.


2006 Civic EX 205K/AT
2006 Acura TSX 187K/AT
Re: Coolant Question - Can it degrade or go bad? [Re: maverickfhs] #4705987
03/25/18 12:12 AM
03/25/18 12:12 AM
Joined: Oct 2014
Posts: 2,720
San Antonio, TX
Nyogtha Offline
Nyogtha  Offline
Joined: Oct 2014
Posts: 2,720
San Antonio, TX
Valvoline lists shelf life for their Zerex brand antifreeze products on their web site, in the PI sheets. I use those as my go-by, it varies from 2 years to 5 years depending on specific antifreeze type.

You could call or email Valvoline to get their viewpoint on what happens when antifreeze shelfife is exceeded.


"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 Question - Can it degrade or go bad? [Re: maverickfhs] #4720914
04/08/18 07:15 PM
04/08/18 07:15 PM
Joined: Apr 2004
Posts: 7,878
New York
pbm Offline
pbm  Offline
Joined: Apr 2004
Posts: 7,878
New York
About 6 years ago I put traditional green Zerex made in 1998 (from an unopened container in my garage) into a newly purchased (used) 2008 Hyundai Elantra. When I changed the timing belt 2 years later the water pump looked brand new.
I don't think unopened coolant deteriorates over time enough to worry about.

PS: None of the coolant had settled out in the container despite sitting all of those years....


'Journalism is Dead'
Re: Coolant Question - Can it degrade or go bad? [Re: maverickfhs] #4734159
04/21/18 11:53 AM
04/21/18 11:53 AM
Joined: Sep 2005
Posts: 5,979
MIchigan
Warstud Offline
Warstud  Offline
Joined: Sep 2005
Posts: 5,979
MIchigan
Yes it degrades and can go bad. The inhibitors do break down and don't protect metal as well as fresh AF. Also Coolant becomes Acidic and corrodes metal. To stay on top of the game...you can always buy test strips and check your fluid every year.


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