I know that Dexcool is a product recommended for GM aluminum radiators but was curious if it was ok to run in my '87 NA. I'm not sure if it would eat the seals or not.

 

I don't recommend it, not even for a GM vehicle...

 

Not a good idea.
http://fc3spro.com/TECH/MODS/COOL/ctype.htm
http://www.consumeraffairs.com/news0...m_dexcool.html
http://www.imcool.com/articles/antif...le-Excerpt.pdf

 

I wouldn't. Use green antifreeze.

 

Yea stick with Gold, Green, or Yellow. Dexcool was a bad idea and even in GM cars causes problems. Gold(Global) or Yellow would be better since both are longer lasting(more protection) still reccommend flushing every couple years or sooner.

 

Dexcool is just an epic fail attempt from GM, they just want people to "Believe" that its better than "standard" green stuff. in fact the Dexcool stuff is FAR WORST than even the cheapest "typical" Green EG stuff out there. Just think of it, Dexcool made GM's OWN cars overheat. drain & flush the stuff away with Green stuff solves all overheating issues.

Only morons use Dexcool stuff.

 

Dexkill.

 

And therefore GM also recommends you add their "special additive", which is nothing more than coolant system stop leak or small beads, after replacing your coolant leaking intake manifold gaskets on their pushrod engines to prevent further leaks.....

I have seen bad cooling systems using the green stuff, but nothing as bad as a car using dexcool, that stuff is a mess....

It will probably eat your whole engine...

 

Thank you for all your advice.

 

i worked for GM for 3 years and it was bad even on their own vehicles.

 

Dexi -Drain!

 

BWAHAHHA got to remember that one...

IMHO- I only use Peak + distilled water or Peak 50/50 premix. No problems in my cars since I've switched to that

I've also herd form a reputable Honda mechanic to avoid Prestone as well.

 

For some reason I saw higher temp on my 8 when I use Peak (+ distilled or just 50/50)

and with Prestone, temps are couple Celsius lower

Only bad thing about Prestone is the price I guess ? I still have a lot of Peak in my house (got 5 cars in my family) I can try it again when the spring comes.

but yeah, stay away from Dexcool.

 

Avoid the Deathcool!

It's not for nothing they were defendants in a class-action lawsuit!

http://www.dexcoolsettlement.com/

 

You Honda guy knows his honduhs. Don't let him tell you about your Mazda.


This is a completely different issue. HOnduhs should not use anything with silicate anti-corrosion technology. This includes Prestone, and most likely the store brands of antifreeze that are colored green.

Honduhs require Phosphate anti-corrosion additives. The silicate type will abrade the water-pump. This is not an issue with our water-pumps.

Dexcool is OAT, (organic acid technology). OAT is very intolerant of hydrocarbon contamination and of aeration. These two issues are very common on rotary engines.

Stay away from Dexcool. Use Green-Prestone etc. and you will be fine. You could use Honduh Phosphate coolant, but it is expensive and you have to go to the dealer to get it.

 

I'm resurrecting this thread to note that Prestone may not be ok to be the go to anymore. It is now an OAT formulation as well. What I'm having trouble confirming is if it has 2-EHA (which stands for 2-ethylhexanoic acid). This is apparently what damages gaskets and seals because it is a plasticizer. All signs point to it being a Dexclone so may need to avoid it as well now.

 

I can't find anything that says regular old Prestone is an OAT? Some of their special formulations are, but it appears to be specifically called out that way. Can you shed some light on that?

 

Ford Specialty Green or the equivalent 50/50 from Mazda, be happy.

 

The only Prestone literature I can find that confirms it is an OAT is in this whitepaper from this page on their site https://prestone.com/cor-guard

https://prestone.com/application/fil...0-%20Final.pdf

Being an OAT formulation I don't think is necessarily a problem, it's if it has 2-EHA. That I think is the determining factor IMO on whether it is still ok to use. All I can get on that is internet hearsay as some say it does some say it doesn't but no one gives sources. Some one said it uses carboxylic acid which some statements in the whitepaper support. Someone said it's the same thing as 2-EHA but I haven't researched it enough to know at this time.

Reading the whitepaper almost convinces me to keep using it but I think I'm gonna switch to Zerex Asian.

 

+1. 0000-77-501E-02 is the Mazda part number. Mazda also has a "long life" FL-22, 0000-77-508E-20, its pre diluted, so you need 2 gallons

 

The Mazda FL-22 is all I will use in my Mazdas. It's never caused any issues for me and provides excellent protection for the cooling system.

 

Hope this doesn't muddy the waters but from this thread on Bob Is The Oil Guy https://www.bobistheoilguy.com/forum...atible-mixable

Valvoline claims in their response to the O.P. that the Zerex Asian (Blue) is the same as FL-22. Not sure if they mean same thing because they are both a PHOAT formulation but I'm guessing that's why.

Anyway seems the antifreeze to use is:
Mazda FL-22
Ford Specialty Green
and now Zerex Asian( Blue).

 

I didn't know Zerex offered a blue, I thought it was red?

 

They have both. Red is for Toyota/Lexus/Scion though I think the color is the only difference between the two.
https://www.valvoline.com/our-produc...freeze-coolant

 

Well, shucks. I was about to drain and flush the coolant in my TII, but now I'm wondering if this bottle of Prestone I picked up is really the best anymore. So many dang formulations.