I had to have the A/C evaporator replaced (under warranty) in my 300M last month. Because the heater core has to be removed in order to get at the evaporator, the shop (CarMax) had to drain the coolant. I discovered last week that they had refilled my system with DexCool. My 300M came from the factory with G-05 coolant and Chrysler has warned dealers in a couple of TSBs not to use DexCool in these all-aluminum engines. I guess the ASE certified techs at CarMax just assume that DexCool can be used where any so-called "long life" coolant is specified.
Anyhow, I took my car to my trusted shop yesterday with six gallons of distilled water and two gallons of Zerex G-05. Four gallons of distilled water were used to completely flush the system and rid it of the DexCool. The remaining two gallons of distilled water were mixed with the two gallons of G-05 to refill the system.
Object of the story: If your car requires a type of coolant other than the standard green or DexCool, don't assume the person working on your car will put the correct coolant in if anyting is done to the cooling system. This also applies to complimentary "toping off" of fluids. Most shops will pour the same antifreeze in every car's tank, no matter what's in it.
Anyhow, I took my car to my trusted shop yesterday with six gallons of distilled water and two gallons of Zerex G-05. Four gallons of distilled water were used to completely flush the system and rid it of the DexCool. The remaining two gallons of distilled water were mixed with the two gallons of G-05 to refill the system.
Object of the story: If your car requires a type of coolant other than the standard green or DexCool, don't assume the person working on your car will put the correct coolant in if anyting is done to the cooling system. This also applies to complimentary "toping off" of fluids. Most shops will pour the same antifreeze in every car's tank, no matter what's in it.