[qqzj]

I recently read two articles on coolant

http://www.autoserviceprofessional.com/article/92419/Coolant-and-colors-What-are-car-makers-up-to

https://www.holtsauto.com/prestone/2016/09/29/why-is-coolant-different-colours/

After reading these (especially the 1st one), it is my understanding that the old type coolant with silicon and phosphor is actually good for our engines which is cast iron block with aluminum head, as long as the owner does not consider changing coolant once very two years is too much of a burden. Is my interpretation correct?

Thanks a lot.

 

[Stillrunning]

Walmart SuperTech 5 year. Compatible with everything. No science necessary.

 

[insightbrewery]

If you can wait a couple days for Amazon, I'd go with Zerex Asian Vehicle. It's the same pink as Toyota Super Long Life allegedly, so my stickler customers don't cause a commotion.

 

[JohnGD]

Lol!!

walmart supertech 5 year. Compatible with everything. No science necessary.

 

[JohnGD]

The silicates/phosphates of the old time "green" coolant is short-lived. That's why Toyota moved to phosphates PLUS benzoates for the Red and got rid of the silicates that can precipitate out of the solution in certain conditions. So personally I think Toyota Red is an improvement over the traditional Green (not the later HOAT green and blue, etc).

Now the market is flooded with clones of GM Dexcool - basically sebabic acid (same as in Toyota Pink) plus the dreaded 2EHA (2-ethyl hexanoate). 2EHA is a plasticizer, and has caused leaks in GM cooling systems with nylon-6,6 seals in the intake manifold. It will also soften silicone seals. That's why I'm reluctant to use it in cooling systems not designed for 2EHA.

The Pink replaced the benzoate with the sebacic for even longer service life, but the Pink is terrible in fighting corrosion in systems with copper/brass stuff (such as heater cores). So I think the best choice Pre-Gen 5 is still Toyota Red. You can buy Pentofrost A1 at Autozone for about $27. If you want to cheap out, get Pentofrost A2 for Subarus for about $24. These are 100% concentrates. Much cheaper than what Toyota's trying sell distilled water for. The Subaru Green is what Toyota wants you to use in Scion FR-S, which is basically a Subaru BRZ.

And since Toyota didn't add tolytriazole or benzotriazole like Ford did in its move to a single world coolant for Ford vehicles, the Pink really is NOT a retrofit for older cooling systems.

http://articles.sae.org/8242/

 

[insightbrewery]

The silicates/phosphates of the old time "green" coolant is short-lived. That's why Toyota moved to phosphates PLUS benzoates for the Red and got rid of the silicates that can precipitate out of the solution in certain conditions. So personally I think Toyota Red is an improvement over the traditional Green (not the later HOAT green and blue, etc).

Now the market is flooded with clones of GM Dexcool - basically sebabic acid (same as in Toyota Pink) plus the dreaded 2EHA (2-ethyl hexanoate). 2EHA is a plasticizer, and has caused leaks in GM cooling systems with nylon-6,6 seals in the intake manifold. It will also soften silicone seals. That's why I'm reluctant to use it in cooling systems not designed for 2EHA.

The Pink replaced the benzoate with the sebacic for even longer service life, but the Pink is terrible in fighting corrosion in systems with copper/brass stuff (such as heater cores). So I think the best choice Pre-Gen 5 is still Toyota Red. You can buy Pentofrost A1 at Autozone for about $27. If you want to cheap out, get Pentofrost A2 for Subarus for about $24. These are 100% concentrates. Much cheaper than what Toyota's trying sell distilled water for.

And since Toyota didn't add tolytriazole or benzotriazole like Ford did in its move to a single world coolant for Ford vehicles, the Pink really is NOT a retrofit for older cooling systems.

http://articles.sae.org/8242/

Great info, thanks. Well, time to get rid of my half-bottle of Pink

 

[Kingdom934]

Great info, thanks. Well, time to get rid of my half-bottle of Pink

IIRC wasn't the toyota 'pink' pre-filled from factory from 2004 models and on? In theory, since this was a lot of 'mid year' for most models (i.e. Camry 02-06 , Corolla 03-08), shouldn't the system be able to take either or coolant unless the 2004+ systems had different components that was design for pink?

Either coolant (Pink or red...even green) IMO should be fine if you drain and refill at normal internals though.

 

[insightbrewery]

IIRC wasn't the toyota 'pink' pre-filled from factory from 2004 models and on? In theory, since this was a lot of 'mid year' for most models (i.e. Camry 02-06 , Corolla 03-08), shouldn't the system be able to take either or coolant unless the 2004+ systems had different components that was design for pink?

Either coolant (Pink or red...even green) IMO should be fine if you drain and refill at normal internals though.

Since none of the Toyotas I've worked on go through what you would call "severe duty" I was going to try changing the first one (2001 Camry 5S-FE) at the interval on the bottle, just to see. It's been 3.5 years and no complaints from the owner.

I don't put much stock in dealer parts counter monkeys but the guy at my local Toyota dealer says they recommend Pink for everything (backwards compatible with Red).

I'm heeding what John said about composition and effect on copper and brass components, I'll pull the heater core on the 2001 in a few months and report back.

 

[Kingdom934]

Since none of the Toyotas I've worked on go through what you would call "severe duty" I was going to try changing the first one (2001 Camry 5S-FE) at the interval on the bottle, just to see. It's been 3.5 years and no complaints from the owner.

I don't put much stock in dealer parts counter monkeys but the guy at my local Toyota dealer says they recommend Pink for everything (backwards compatible with Red).

I'm heeding what John said about composition and effect on copper and brass components, I'll pull the heater core on the 2001 in a few months and report back.

I've read you can use red in pink as a top off but not recommended to use red in a pink system. Supposedly shouldn't use pink in a red system only tho. Although I think there is too much thought about it...better than having worn out coolant I think.

Yea. I've used Red in my 2004s for now. Gonna switch to pink when comes around to do the coolant. I personally stick to Toyota red or a compatible pink. I use green for my friends cars (whatever they run currently) and my older Toyota.