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Dexcool

SoLow

Well-known member
Joined
Apr 25, 2004
Messages
221
Location
Atlanta Ga
Corvette
87 dark red coupe 96 Pro Street Project
If I am replacing the anti-freeze in my 87 L-98...Can I use the Dexcool anti-freeze that's used in 96 and up ?:confused Also...Can I also use the Mobil 1 oil?:confused If not...Why?
 
When i flushed mine i just used the green antifreeze and it runs pretty cool and it is cheaper. I do not know why you would not be able to run dexcool :confused and you can use Mobil 1 oil. I run castrol 10w40 synthetic
 
SoLow said:
If I am replacing the anti-freeze in my 87 L-98...Can I use the Dexcool anti-freeze that's used in 96 and up ?:confused Also...Can I also use the Mobil 1 oil?:confused If not...Why?

Yes, you can use those. I use Dexcool and Mobil 1 with no problems whatsoever. :w Make sure to use a good filter, ie. not FRAM. ;)
 
You have to completely flush out any remaining ethlyene glycol (green) coolant before installing the orange Dexcool coolant. Apparently mixing even small quantities of the two types will cause problems. Given the possible problems, I would just stay with a green coolant.

Unless you have a lot of sediment in your cooling system, flush 2 or 3 times with tap water. Otherwise use a very mild radiator flushing chemical and follow the instructions. Flush the chemical completely out with water. This is also a good time to replace the upper and lower radiator hoses. Check the heater hoses too.

Get a good green coolant (I've been a Prestone fan for years and never had any problems) and mix in a 50/50 ratio with distilled water. Distilled water is pretty much free of contaminents and it's cheap (about $.85/gallon) It can be found at your grocery store. Pull the overflow bottle out and clean it (there will be a fair amount of sediment in there) and refill with a 505/50 mix.

Depending on the mileage, it might be worth installing a new thermostat and radiator cap. I have a 180 'stat in my 87 and it seems to work just fine. On most days the temps never gat above 180 and even in very hot weather, I usually see 185-195 even in slow city traffic.

You can switch to a synthetic with no real problems, but you may see some oil leaks where you never had them before. Synthetics are supposed to clean better and will get into very tiny areas where dino oil may not easily flow and you can see some leaks appear. Synthetics will lower the oil temps some and definetly reduce wear. Use a good oil filter like AC Delco, K&N, Mobil-1 or Purolator. Stay away from Fram filters and the parts store cheapies.
 
Ditto to what the previous reply was except you have to ask yourself about switching to the synthetic oil, how many miles do I have on this? Why, because the natural oils have embedded them selves in the gasket materials, and it is 17 years old, switching to the synthetic may (I'd almost guaranteee) expose all the carbon compounds in the natural oils have glazed over the ends of the gasket faces and kept them solid over all these years, and allow the synthetic oil to seep through. Are you willing to put up with all these, especially from the valve conver gaskets and the intake manifold ends.


If you switch to dexcool you must back flush everything, and this might be a time to replace all the hoses under the hood, so all the green ethylene glycol is completely out. I wouldn't recommend using any of those "radiator flush" products, expecially when you have bimetalic situation such as you. (Iron block, aluminum head). I'd also recommend replacing the thermostat at this time, actually I removed mine while I flushed things out! When it came to filling the system, I slowly filled it right there, until it came up to the top of the intake maniforld housing, inserted the thermostat, and the top of the housing, then filled the system the rest of the way from the radiator. The amount of entrapped air in the block was negligible.

I then ran it with the radiator cap off to ensure the thermostat opened at the proper temperature and the coolant was circulating.

Done in an evening, with sufficient breaks for pizza and LF.....

LOL
 
think twice about Dex-Cool???

I am not sure if they have reformulated Dex-Cool but this stuff just about killed my 94 Firebird! It cost me over $400 bucs to clean up the mess this stuff left behind. There was/is a class action lawsuit against GM regarding the use of this product. I personally wouldn't use it in my Vette.

.....just FYI!!


Dexcool

General Motors and ChevronTexaco Sued in Class Action

The law firms of Cory Watson Crowder and DeGaris, P.C., Whatley Drake LLC and King Marker Armstrong LLC have filed a class action suit against General Motors, ChevronTexaco, Equilon and ChevronTexaco Global Lubricants alleging defective engine coolant systems in most General Motors vehicles, light trucks and SUVs sold since 1996. That was the year that General Motors made the decision to begin using Dexcool as the antifreeze/coolant in theses vehicles. Dexcool is manufactured, distributed, and marketed by ChevronTexaco, Equilon and ChevronTexaco Global Lubricants.



The suit, ROBIN FLYNN and CHERYL HALL et al. vs. GENERAL MOTORS CORP., et al. filed in Madison County, Illinois seeks to compensate class members for damages to their vehicles. The most commonly reported damages included corroded, rusted and clogged radiators, eroded aluminum cylinder heads, eroded water pumps and thermostat housings, rotten and leaking radiator hoses, leaky heater cores and freeze plugs, corroded radiator caps, deposits within the cooling system, damaged and leaky cooling system gaskets, damage to the head gaskets, chronic overheating, damage to the engine, oil in engine coolant system, leaking coolant, deposits on the overflow tanks and sludge in the engine coolant system.

Dexcool was initially marketed as a long life universal automotive engine coolant that would last for 5 years or 100,000 miles of service. It is now marketed to last for 5 years or 150,000 miles of service. Manufacturers of traditional antifreeze / coolants generally market that their antifreeze / coolants will provide dependable thermal control and corrosion and rust protection for twenty-four (24) months or 30,000 miles. The major difference in Dexcool over traditional coolants is in the corrosion inhibitor protection. Traditional antifreeze / coolants contain inorganic salts of borate, phosphate, silicate and other chemicals to prevent rust and corrosion, whereas, Dexcool’s® corrosion inhibitor components, are based on organic acid technology (OAT). Dexcool is orange and traditional antifreeze is green.



Over thirty-four million vehicles have been sold and continue to be sold by General Motors containing Dexcool. In many of these vehicles, the problems in the engine coolant system do not become apparent to owners until after the warranty has expired. General Motors has not agreed to repair vehicles not in warranty, recall vehicles, replace Dexcool with traditional coolants, change the maintenance schedule to include inspection of the engine coolant system, replace the coolant or inform owners.

The pending class actions seek relief on behalf of all owners of GM vehicles that came from the factory with Dex-Cool. If you are the owner of one of these vehicles, you are a potential class member. If the litigation is successful, all class members will be notified and provided with the paperwork necessary to file a claim. There is no need to contact us at this time, but please visit our website periodically for updates on important developments, bearing in mind that we do not expect any major developments until near the end of 2004.

If you have any questions about the Dexcool litigation you may email your inquiries to F. Jerome Tapley at jtapley@cwcd.com.
 
Indeed, you need to flush out all remanining green coolant if you wish to switch over to Dex-Cool. I saw a news report on TV shortly after changing over to Dex-Cool saying nothing but bad things about it, and interview with owners that plan on taking legal action against GM. They claimed it caused extensive engine damage that GM refused to pay for. Seems like some folks here have had no problem with it, but I shortly switched back to the old Green coolant for peace of mind. I was not taking any chances, plus it's cheaper and I never really had a problem with the Green coolant anyway.
 
I bought my 85 C4 in 1986, In 1996 I switched over to dex-cool (50/50 mix with distilled water ) and sold it in 2000 with no cooling system problems . When I switched over to Mobil I motor oil is when my problems started. My motor leaked oil at the valve covers, the oil pan, and the front seal. After replacing all the gaskets and seals i switched back over to non-synthetic. Also have been running dex-cool in my 1993 big block (454) Chevy Suburban also since 1996 that I still have with no problems what's so ever !!! Just my $.02 worth !!
 
Green for me

I switched to Prestone. Yes Green in a '96. Combining has no ill effect except negating the long life of Dexcool. However Dexcool has a problem with air, and if there is a leak the trouble starts.

My block and radiator were perfect with the red, but after reading about the problems in other GMs I switched. The red stuff people (Texaco) have now recommended changing every 2 years, the same as green.

Once you go green you can't go red because the metal has ingested the chems and red won't last. The abscence of silica in the red is not enough benefit IMO.

I think the regular has narrowed the temp swings and keeps her consistantly cooler. The book says red, so it's a hard call.
 
Well I work on these Dexcool systems ALL day long 6 days a week and you know what GM can take that orange $%^ and do you know what with it.

This is my opinion and anyone can take it or leave it but I will NEVER install this "product" in one of my cars.

I get car in with less than 40'000 miles on them wanting to know why they have no heat....The heater core is plugged...why its only got 40k on it.....because you didn't maintain for MAINTENANCE FREE 100k mile coolant so it gelled up and plugged your system....So warranty?....NO!!!! 500$ and up for us to clean and reinstall the same crap so you can come in again and again and again.

Junk...

Filtered Water and Green coolant is hard to beat. We've been running it for HOW MANY YEARS!!! and how many REAL stories have you heard stem from he fact that green coolant is junk.....I haven't heard any!!

Ive heard and worked on cars that the owners didn't know how to pop the hood but how is that the cars fault?

I have actually gotten vehicles in after the warranty inspections and pulled out the orange for green!

Ever funnier! I did one for a guy that works AT THE DEALER! (We're cheaper than they are and we're side by side so we actually do ALOT of dealer business) On a Camaro!

Dex is a scam just ask your local Vortec lower intake how its holding up....because I do 4 a week all with less than 100K on them.

IMHO of course, and thats my vent for the week!

:mad
 
One more thing I just left that Imcool site and I can't even type Im laughing so hard!!


I mean the last time I heard that many excuses....well nevermind! LOL

This picture is what I see on 80% of the Dex systems I see...

Must be that darn contamination on my BRAND NEW CAR!....

Or shoot I forgot to burn my service manual and fill to or past the HOT line when cold! Im sure the neighbor's dog will love the sweet flavor after it bursts out of the res-jug because it had no where else to go!
 
Use some tap water and acetone guys, that's the best for all coolants :)))))
 
Thanks for everyones input..........GLAD I asked! Now I have to go drain that crap out of my truck!

Ed
 
BigRed said:
Well I work on these Dexcool systems ALL day long 6 days a week and you know what GM can take that orange $%^ and do you know what with it.
:mad
That's all the proof I need right there to stay away from DexCool.
 
Im sorry but I had to say something! GM has seriously got to revue this decision. I don't want to be the tribal hate leader but I know how much we love our car and Im sure everyone else is the same! I could just imagine everyone coming to the forum a year from now starting new threads called.....Whoops.

BTW today, ANOTHER 3.8 Chev's in for ANOTHER intake manifold because of broken down gaskets and plugged ports......100k Km's.....Grand Prix.

All in a days work but I hate having to explain to customers that they have junk running through they're veins and they can't do nothing about it till its off warranty...or ""warranty"" I should say.
 

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