Nothing!
The mechanic told me yesterday after doing my trans flush that my engine coolant is green and I should be using Dex-Cool.
Should I worry about this or is this something that needs to be addressed ASAP?
Great vehicle and awesome performance. Handles beautifully in the snow.
66.
Hello, I own a 1998 Monte Carlo Z34 and love it! I have done a lot of work on the car and have become VERY familiar working with the 3800 V6 engine. In referring to your engine coolant, green is not the original style coolant, but there is a good reason to keep it. GM dealerships want to use Dexcool because that is what was originally in the car and that is what GM makes and prescribes for their cars. This coolant has been a major problem for the GM V6 engines in the last several years due to the fact that over time, it becomes corrosive and acidic, eating away at gaskets in the engine. You can even google "Dexcool lawsuit" and you can see that a class action lawsuit against GM for this problem has just won its case. Dexcool also has a tendency to become thick and pasty, which is also definately not good! The fact that you have green coolant in your engine is A GOOD thing. Regardless of what the GM mechanic says, keep green or dex-compatible orange coolant in the motor. Compatible coolant is of no harm, but the real Dexcool is. Many people that own 3800 V6's experience upper intake manifold failure or lower intake gasket failure, in part due to Dexcool. I just had both replaced yesterday at 120k miles, and had Dex-compatible coolant put in. For more specific info, take a look at bonnevilleclub.com, which has a TON of GREAT information for maintaining, modifying, and do-it yourself repairs for the 3800 engine. So, you have nothing to worry about--keep the green coolant! Hope this helps and enjoy your Monte!
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