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Extended life destroys copper? #5328604 01/21/20 09:49 AM
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mpack88 Offline OP
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I read in one of these forums that extended life antifreeze destroys copper. Most of my car's I have converted to extended life antifreeze over conventional green. Should I go back to green? Does anyone have any proof of this?

Re: Extended life destroys copper? [Re: mpack88] #5328624 01/21/20 10:17 AM
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kschachn Offline
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Whatever next.

Why not use the coolant type specified by the vehicle manufacturer?

Last edited by Kestas; 01/21/20 11:47 AM. Reason: No need to completely quote the first post in the second post.

1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: Extended life destroys copper? [Re: mpack88] #5328652 01/21/20 11:00 AM
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IndyFan Offline
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I think kschachn has the right answer.

I've used Mopar and Zerex G05 in my 08 Jeep, as recommended by Jeep, changing it ever 5 years. It is now 13 years old and has 138k miles on it and the cooling system appears to be clean and healthy. I doubt anything's been destroyed in it. Even the original water pump appears to be going strong, with no unusual play, noise, or even seepage.

I think putting a coolant formula not specified by the manufacturer could potentially cause some problems, though.


18 Jeep JLUR Wrangler 3.6 29k
15 Ford Transit 129k, Reman 3.5 @85k
17 Jeep Renegade 2.4 22k
08 Jeep Wrangler 3.8 139k
04 Jeep Grand Cherokee 4.7 109k
99 Mercedes E430 Sport 99k
Re: Extended life destroys copper? [Re: kschachn] #5328678 01/21/20 11:45 AM
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Neely97 Online Sick
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Originally Posted by kschachn
Originally Posted by mpack88
I read in one of these forums that extended life antifreeze destroys copper. Most of my car's I have converted to extended life antifreeze over conventional green. Should I go back to green? Does anyone have any proof of this?

Whatever next.

Why not use the coolant type specified by the vehicle manufacturer?


Sage advise .

Re: Extended life destroys copper? [Re: mpack88] #5328717 01/21/20 12:25 PM
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Linctex Offline
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Not much "destroys copper" except very strong acids.


"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: Extended life destroys copper? [Re: mpack88] #5328727 01/21/20 12:32 PM
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Chris142 Online Content
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I work at a Radiator shop. Dexcool and the Dexclone coolants eat the solder that holds the copper parts together..


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Extended life destroys copper? [Re: mpack88] #5328734 01/21/20 12:36 PM
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nthach Offline
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All coolants have azole to protect yellow metals. I think it's nitrate or nitrite you want that protects solder, which Dex-Cool and the new ELCs for truck/bus applications lack.

Prestone Cor-Guard added phosphate back to protect CAB heat exchangers.

Re: Extended life destroys copper? [Re: mpack88] #5328739 01/21/20 12:42 PM
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Gebo Offline
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I'd go back to green if that is what is specified in your owner's manual.


'98 LEX LS400 305K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 70K

Shell Gas and Truck 5W-30
QS HM 10W-30
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Re: Extended life destroys copper? [Re: mpack88] #5328750 01/21/20 12:55 PM
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nthach Offline
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Green or G-05/G-48(otherwise Mercedes would have not backspeced it for their older cars) would be my picks. I'd avoid AMAM coolants unless there is mention of nitrite.

The Prestone Cor-Guard I mentioned was introduced also to address solder failure with the newest CAB-brazed heat exchangers, but those use an unleaded solder and flux not too far off from what's used in potable plumbing.

Re: Extended life destroys copper? [Re: mpack88] #5328758 01/21/20 01:01 PM
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mpack88 Offline OP
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But the coolant I use was just regular extended life it has a green color but it's not the same as conventional. So I guess I better question would be with my older cars with copper cores and radiators be fine with that?

Re: Extended life destroys copper? [Re: mpack88] #5328773 01/21/20 01:15 PM
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kschachn Offline
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Originally Posted by mpack88
But the coolant I use was just regular extended life it has a green color but it's not the same as conventional. So I guess I better question would be with my older cars with copper cores and radiators be fine with that?

An even better question is what is the manufacturer's recommended coolant for each of your vehicles?


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: Extended life destroys copper? [Re: mpack88] #5328790 01/21/20 01:49 PM
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Brian123 Offline
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Originally Posted by mpack88
I read in one of these forums that extended life antifreeze destroys copper. Most of my car's I have converted to extended life antifreeze over conventional green. Should I go back to green? Does anyone have any proof of this?


Driving home in the middle of the night, and I want to get home with no problems, then the manufactured coolant is acceptable. If you wanna save some pennies on universal coolant do you want to be standing by the road waiting for a tow. I am not going to say it will happen but I am not going to take the chance. JMO

Re: Extended life destroys copper? [Re: mpack88] #5328792 01/21/20 01:51 PM
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nthach Offline
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Originally Posted by mpack88
But the coolant I use was just regular extended life it has a green color but it's not the same as conventional. So I guess I better question would be with my older cars with copper cores and radiators be fine with that?

Pics of the bottle?

Zerex fits that description but it's a weird hybrid between an conventional coolant and pHOAT.

Re: Extended life destroys copper? [Re: mpack88] #5328814 01/21/20 02:28 PM
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Re: Extended life destroys copper? [Re: kschachn] #5328846 01/21/20 03:01 PM
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atikovi Offline
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Originally Posted by kschachn
Whatever next.

Why not use the coolant type specified by the vehicle manufacturer?


Maybe because over time improvements are added to the products? By that argument, would you use the non-detergent SA grade oil probably recommended in the owners manual of a '57 Chevy? Or alcohol for coolant as recommended in the owners manual of a Model T?

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