I wasn't aware of an issue "eating" aluminum but I do remember some noise about 10 years ago about problems with unprotected surfaces if the coolant level was too low. Also a possible issue with softened gaskets and plastics....maybe that is why we see so many and tank failures in these radiators?
Not sure what to do to be honest. Are you planning on a complete coolant change? Is so, then maybe traditional coolant will be okay?
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A lot of issues with damaged radiators on these cars was because of ignorance on the part of owners improperly maintaining them. Example: From factory, there was an additive installed in the radiator to help preserve the life of the radiator and leaks. Issue was it collected on the bottom of the tank and when removing the coolant dipstick to check coolant levels, this additive descried by many as "gunk" was gobbed on the end of the dip stick. Many panicked thinking the DEXCOOL was breaking down and destroying the radiator so radiators were flushed. Owners not knowing any different mixed standard antifreeze with the DEXCOOL and they themselves destroyed their radiators, or dumped their car and the new owner(s) were left with the ramifications of the previous owner's ignorance.
Some flushed their radiators and replaced with DEXCOOL but didn't reinstall the proper additive like the factory used to help in longevity or to help with possible leaks. Now these cars are older and many 2-4 owners people are having issues with radiators. My 2005 was purchased new. Has 48K on the clock and I never flushed the radiator. My car doesn't suffer from things done to it that shouldn't have.
I have not heard anything about DEXCOOL eating aluminum but I know the folks at Max Performance and they know their stuff. HOWEVER ............ the manual says use DEXCOOL only, there is a reason (internal part proper lubrication from the recommended fluid from factory) this is where folks screw up. Straight from the manual:
What to Use
Use a mixture of one-half clean, drinkable water and
one-half DEX-COOLŪ coolant which will not damage
aluminum parts. If this coolant mixture is used, nothing
else needs to be added.
Adding only plain water to your cooling
system can be dangerous. Plain water, or
some other liquid such as alcohol, can boil
before the proper coolant mixture will. Your
vehicle’s coolant warning system is set for the
proper coolant mixture. With plain water or the
wrong mixture, your engine could get too hot
but you would not get the overheat warning.
Your engine could catch fire and you or others
could be burned. Use a 50/50 mixture of clean,
drinkable water and DEX-COOLŪ coolant.
If you use an improper coolant mixture,
your engine could overheat and be badly damaged.
The repair cost would not be covered by your
warranty. Too much water in the mixture can freeze
and crack the engine, radiator, heater core and
If coolant needs to be added more than four times a
year, have your dealer check the cooling system.
Notice: If you use the proper coolant, you do not
have to add extra inhibitors or additives which claim
to improve the system. These can be harmful.
I have been reading for 10 years now owners complaining about their cooling system, each time it's because they modified it. Many original owners I know who still have their 4th gen GTOs and did not monkey around with the cooling system have not had issues. IMO do not use anything else other than DEXCOOL.
I have several Dodges. A Ram, a Challenger and a Charger. MOPAR has their own version of DEXCOOL and their manuals state not to use antifreeze as well. Manufacturers spend bokoo bucks in research on what goes into their engines, oil, coolant etc......... they recommend in the manual the proper viscosity etc to use. It's when people deviate from the manufacturers recommendations they have issues OR they dump the car before those issues surface and the next owner is stuck with those problems..........