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11 year coolant drain and refill #5074354
04/14/19 08:20 AM
04/14/19 08:20 AM
Joined: Jun 2013
Posts: 414
sw ohio
willbur Offline OP
willbur  Offline OP

Joined: Jun 2013
Posts: 414
sw ohio
Greetings-
BITOG paranoia set in and I finally decided to drain the OE coolant in my 2008 Honda v6 (100K miles). Came out crystal clear and the inside of radiator neck showed a like new appearance. Voltage readings were well below allowable limits, too. Refilled with Zerex Asian blue.

Honda coolant probably could have lasted for another 11 years.

Re: 11 year coolant drain and refill [Re: willbur] #5074370
04/14/19 08:38 AM
04/14/19 08:38 AM
Joined: Feb 2013
Posts: 339
FL USA
Blueskies123 Offline
Blueskies123  Offline

Joined: Feb 2013
Posts: 339
FL USA
My Toyota was the same way.

Re: 11 year coolant drain and refill [Re: willbur] #5074384
04/14/19 09:00 AM
04/14/19 09:00 AM
Joined: Jan 2011
Posts: 3,114
N.Ohio
Lubener Offline
Lubener  Offline

Joined: Jan 2011
Posts: 3,114
N.Ohio
Drained coolant for the first time last summer on my father's 2003 Mercury. Came out clean but did it one more time later to be safe.

Last edited by Lubener; 04/14/19 09:02 AM.

The "thinking" man's friend.
Re: 11 year coolant drain and refill [Re: willbur] #5074410
04/14/19 09:36 AM
04/14/19 09:36 AM
Joined: Dec 2017
Posts: 4,506
SE British Columbia, Canada
Snagglefoot Online content
Snagglefoot  Online Content

Joined: Dec 2017
Posts: 4,506
SE British Columbia, Canada
The truth is that some of these coolants are excellent. It used to be coolant were good for 3 years, then 5 years and some manufacturers are now suggesting 10 years. The coolant manufacturers are putting themselves out of business. I use 5 years. No problems. smile


If you want the job done right......do it yourself.
Re: 11 year coolant drain and refill [Re: Snagglefoot] #5074429
04/14/19 09:47 AM
04/14/19 09:47 AM
Joined: Apr 2010
Posts: 1,508
Suburban Washington DC
atikovi Offline
atikovi  Offline

Joined: Apr 2010
Posts: 1,508
Suburban Washington DC
Originally Posted by Snagglefoot
The truth is that some of these coolants are excellent. It used to be coolant were good for 3 years, then 5 years and some manufacturers are now suggesting 10 years.


Probably the increased use of all aluminum engine blocks and heads has something to do with it. Whenever I changed the coolant on an iron block years ago, the fluid always looked rusty.

Re: 11 year coolant drain and refill [Re: willbur] #5074571
04/14/19 11:29 AM
04/14/19 11:29 AM
Joined: Sep 2005
Posts: 6,417
MIchigan
Warstud Offline
Warstud  Offline

Joined: Sep 2005
Posts: 6,417
MIchigan
Originally Posted by willbur
Voltage readings were well below allowable limits, too. Honda coolant probably could have lasted for another 11 years.

Can you elaborate?

Re: 11 year coolant drain and refill [Re: Warstud] #5074601
04/14/19 12:10 PM
04/14/19 12:10 PM
Joined: May 2005
Posts: 4,907
SF Bay Area
y_p_w Offline
y_p_w  Offline

Joined: May 2005
Posts: 4,907
SF Bay Area
Originally Posted by Warstud
Originally Posted by willbur
Voltage readings were well below allowable limits, too. Honda coolant probably could have lasted for another 11 years.

Can you elaborate?

Corrosion is somewhat of an electrical process. I guess he was checking for the potential for there to be corrosion.

I remember in some of my engineering classes I was hearing about a certain voltage placed on pipelines to reduce the amount of corrosion. I looked it up, and it's called "impressed current cathodic protection". Steel is protected with a sacrificial zinc coating (galvanized steel), since the zinc corrodes before the iron.

Re: 11 year coolant drain and refill [Re: y_p_w] #5074630
04/14/19 12:42 PM
04/14/19 12:42 PM
Joined: Sep 2005
Posts: 6,417
MIchigan
Warstud Offline
Warstud  Offline

Joined: Sep 2005
Posts: 6,417
MIchigan
Originally Posted by y_p_w
Originally Posted by Warstud
Originally Posted by willbur
Voltage readings were well below allowable limits, too. Honda coolant probably could have lasted for another 11 years.

Can you elaborate?

Corrosion is somewhat of an electrical process. I guess he was checking for the potential for there to be corrosion.

I remember in some of my engineering classes I was hearing about a certain voltage placed on pipelines to reduce the amount of corrosion. I looked it up, and it's called "impressed current cathodic protection". Steel is protected with a sacrificial zinc coating (galvanized steel), since the zinc corrodes before the iron.

I think he means the PH Balance (acidity) is within the allowable limits. But acidity isn't the only reason to change the coolant. The inhibitors wear out over time.

Re: 11 year coolant drain and refill [Re: Warstud] #5074643
04/14/19 12:51 PM
04/14/19 12:51 PM
Joined: Jun 2013
Posts: 414
sw ohio
willbur Offline OP
willbur  Offline OP

Joined: Jun 2013
Posts: 414
sw ohio
Originally Posted by Warstud
Originally Posted by y_p_w
Originally Posted by Warstud
Originally Posted by willbur
Voltage readings were well below allowable limits, too. Honda coolant probably could have lasted for another 11 years.

Can you elaborate?

Corrosion is somewhat of an electrical process. I guess he was checking for the potential for there to be corrosion.

I remember in some of my engineering classes I was hearing about a certain voltage placed on pipelines to reduce the amount of corrosion. I looked it up, and it's called "impressed current cathodic protection". Steel is protected with a sacrificial zinc coating (galvanized steel), since the zinc corrodes before the iron.

I think he means the PH Balance (acidity) is within the allowable limits. But acidity isn't the only reason to change the coolant. The inhibitors wear out over time.


Thank you-
I did not think of acidity but corrosion byproducts due to electrolysis increasing electrical conductivity as an indicator of coolant degradation. Lots of internet info. Just google "coolant voltages" for good explanations. Acidity using voltages is an interesting concept. Hmmm...

I thought about acidity and corrosion. Acidity increases electrolysis which leads to corrosion which then leads to conductive by products and is reflected by observed increase in voltage. Any chemists here to comment?

Last edited by willbur; 04/14/19 01:20 PM. Reason: new idea
Re: 11 year coolant drain and refill [Re: willbur] #5074764
04/14/19 03:04 PM
04/14/19 03:04 PM
Joined: Apr 2013
Posts: 6,182
FL, USA
gregk24 Offline
gregk24  Offline

Joined: Apr 2013
Posts: 6,182
FL, USA
Good to hear. I change mine every 3 years or so. cool


2012 Honda Accord EX-L K24z3
56,xxx miles
PPPP 0w20 / Fram Ultra

2014 VW Jetta SE 1.8T ea888
44,xxx miles
Castrol Edge 0w40 / OEM filter
Re: 11 year coolant drain and refill [Re: Snagglefoot] #5077509
04/17/19 07:46 AM
04/17/19 07:46 AM
Joined: Feb 2019
Posts: 248
New Hampshire
Railrust Offline
Railrust  Offline

Joined: Feb 2019
Posts: 248
New Hampshire
Originally Posted by Snagglefoot
The truth is that some of these coolants are excellent. It used to be coolant were good for 3 years, then 5 years and some manufacturers are now suggesting 10 years. The coolant manufacturers are putting themselves out of business. I use 5 years. No problems. smile

Agreed and I think just the whole cooling systems have evolved as well. Everything is sealed and I just don't see many issues anymore. Yeah you get the water pump failures, of course, but the coolant always looks great for what seems like forever. Even Dexcool and GM products look great for a long long time now.

Re: 11 year coolant drain and refill [Re: willbur] #5079238
04/18/19 08:06 PM
04/18/19 08:06 PM
Joined: Apr 2017
Posts: 1,550
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline

Joined: Apr 2017
Posts: 1,550
Ontario, Canada
Honda coolant is rated to last 10 years. Pretty normal that it was fine at 11 years.


Mighty Mouse Tech
BMW Diagnostic and Alignment Tech
2010 Civic Si Motul 0W40, Redline MTL
2013 BMW 135i M Sport Edition Motul 0W40, Redline MTL
Re: 11 year coolant drain and refill [Re: mightymousetech] #5079378
04/18/19 11:57 PM
04/18/19 11:57 PM
Joined: May 2005
Posts: 4,907
SF Bay Area
y_p_w Offline
y_p_w  Offline

Joined: May 2005
Posts: 4,907
SF Bay Area
Originally Posted by mightymousetech
Honda coolant is rated to last 10 years. Pretty normal that it was fine at 11 years.

My wife's went 17 before there was ever a change. I actually had a bottle about 5 years ago, but it just sat in the cabinet because I wasn't sure how messy it would be. When I finally did it I found that it was ridiculously easy to just drain it. Kind of slow, but the spigot on the petcock goes straight down rather than sideways. I didn't spill a drop on the ground, although I did lay something under it.

Still - there's always something about the initial fill that's different. I remember back in the day of Honda green (not green Type 2) a typical recommendation would be 3 years/45k mile on the factory fill, then 2 years/30k miles after that. The current recommendation seems to be 10 years on the factory fill then 5 years afterwards. I'm guessing part of it is that a drain and fill is only about 75% being replaced. It might even be a little bit conservative.

Re: 11 year coolant drain and refill [Re: mightymousetech] #5079513
04/19/19 06:51 AM
04/19/19 06:51 AM
Joined: Jun 2013
Posts: 414
sw ohio
willbur Offline OP
willbur  Offline OP

Joined: Jun 2013
Posts: 414
sw ohio
Originally Posted by mightymousetech
Honda coolant is rated to last 10 years. Pretty normal that it was fine at 11 years.


Thank you Mighty etc-
I was unaware the Honda coolant is good for 10 years. Where did you find this info? Does the 10 year lifetime spec apply to the original fill 11 year old coolant as manufactures change specs and formulations frequently?

Re: 11 year coolant drain and refill [Re: willbur] #5079820
04/19/19 11:34 AM
04/19/19 11:34 AM
Joined: Apr 2017
Posts: 1,550
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline

Joined: Apr 2017
Posts: 1,550
Ontario, Canada
Originally Posted by willbur
Originally Posted by mightymousetech
Honda coolant is rated to last 10 years. Pretty normal that it was fine at 11 years.


Thank you Mighty etc-
I was unaware the Honda coolant is good for 10 years. Where did you find this info? Does the 10 year lifetime spec apply to the original fill 11 year old coolant as manufactures change specs and formulations frequently?


I was an Acura/Honda tech for 16 years.

The timing belt is normally due before the coolant, and we always did the water pump with the belt as the pump most likely would not last till the second belt change. So, you normally get a coolant change every time the timing belt is done.

Last edited by mightymousetech; 04/19/19 11:36 AM.

Mighty Mouse Tech
BMW Diagnostic and Alignment Tech
2010 Civic Si Motul 0W40, Redline MTL
2013 BMW 135i M Sport Edition Motul 0W40, Redline MTL
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