* Corrosion: Dexcool, particularly older formulations, has been implicated in increased corrosion within the engine's cooling system, especially in aluminum components common in the 3800. This could lead to leaks, head gasket failure, and other expensive repairs.
* Gelling: Dexcool can be prone to gelling, especially if it becomes contaminated with other coolants or becomes too old. This gelling can restrict coolant flow, leading to overheating.
* Incompatibility with other coolants: Mixing Dexcool with other coolants, especially traditional green coolants, can create a sludge-like substance that can clog the cooling system.
Therefore, while some 3800 V6 owners successfully used Dexcool without issues, the risk of problems is significant enough that many mechanics and experienced owners recommend *against* using it. It's much safer to use a traditional green coolant (such as a 50/50 mix of ethylene glycol and distilled water) or a compatible long-life coolant specifically approved for aluminum engines. Always check your owner's manual for specific recommendations.
In short: Dexcool *might* work, but the potential for damage and repair costs makes it a risky choice for the Chevrolet 3800 V6. A more conservative coolant choice is strongly advised.
