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Old 08-30-2010, 12:16 PM
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red coolant

I've heard that red/orange coolant Toyota and GM use is bad and degrades fast and its best to use green instead. Any truth to this?

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Old 08-30-2010, 12:28 PM
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Originally Posted by mitmaks
I've heard that red/orange coolant Toyota and GM use is bad and degrades fast and its best to use green instead. Any truth to this?
It becomes acidic in the presence of air (oxygen). It works well and lasts a long time as long as the system remains closed to the atmosphere. That means you need to stay on top of leaks and keep the reservoir filled sufficiently to prevent air from being drawn into the system from the overflow tank. Some earlier GM models had engine gaskets that were attacked by this stuff which then developed leaks allowing air into the system with disastrous result.

That said, I personally prefer old fashion green coolant of simple ethylene glycol. I recommend this for hot rod and race engines (where coolant is permitted) that see a lot of opening of the cooling system as it just keeps things simpler. If this is an engine that will go years between inspections and modifications, it's just as well to leave the red/orange stuff in there alone unless some other problem demands a change.

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Old 08-30-2010, 12:49 PM
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Chrysler all so had problems with it eating away the freeze plugs. I prefer the green also...
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Old 08-30-2010, 05:12 PM
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the GM dex cool is crap. It is organic acid technology (OAT) and does not perform well at all.It breaks down fast and turns to a sludge in the system and plugs up things.
the old toyota red is a little different as it was some kind of boric salt or something and the NEW toyota red is also OAT formulated.For whatever reason the toyota holds up better

Look here for all the answers. Anything that says Extended Life is OAT and they all wont mix according to color. Too much to list look here

http://www.popularmechanics.com/cars...oducts/1272436

They should make all coolant manufacturers print this on there jugs
I like the green stuff . It lasts like it should and the corrosion protection is hard to beat ( Very Important)
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Old 08-30-2010, 06:08 PM
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Quote:
Originally Posted by oldbogie
It becomes acidic in the presence of air (oxygen). It works well and lasts a long time as long as the system remains closed to the atmosphere. That means you need to stay on top of leaks and keep the reservoir filled sufficiently to prevent air from being drawn into the system from the overflow tank. Some earlier GM models had engine gaskets that were attacked by this stuff which then developed leaks allowing air into the system with disastrous result.


Bogie
I have heard about the acidic aspect of the coolant as well. It would seem that any system with an overflow tank or reservoir is exposed to air as the tank must be vented to allow for expansion when the coolant heats up and empties when the system cools down.

I recently changed the coolant in my wife's 2001 Honda. Honda originally had green coolant in the system and nows says that their new blue stuff is the only approved coolant. Sounds like a marketing gimmick to me.
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Old 08-30-2010, 08:09 PM
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Toyota coolant is nothing like Dexcool, they only share color. Most vehicles today require there own special coolant types. The universal coolants are not and you can cause a lot of damage by using them.
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Old 08-30-2010, 08:43 PM
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If you want a long life coolant you might get the yellow. I usually can buy it cheaper than the green and Dexcool.

There is actually lawsuits against Dexcool, it is fine until it gets air in it.
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