That is really, really unusual. Rarely does a head gasket go bad on the
2.8-3.4 series or the 3.3-3.8. I would tend to disbelieve until backed
up with test data: compression check, leakdown test, exhaust gases in the
2006 Impala's don't have the same engines as your Impala. The new ones
are a 3.5 V6, 3.9 V6 and the SS has a 5.3 V8 with 300 + horsepower.
05 Park Avenue, 32,391
91 Bonneville LE 304,498
If the Dexcool is contributing to the degrading the gaskets, why is GM still
using Dexcool? Their competitors seem to be doing fine with the green
stuff. What is the value add, I guess is the question?
You haven't been paying attention.
The Asians have been using coolant similar to Dexcool's OAT for
quite some time, Ford and Chrysler are using a hybrid version of
the Dexcool OAT inhibitor package also.
The big controversy seems to be about the use of the plasticizer 2-EHA
as one of the components of Dexcool. A plasticizer softens plastics and
apparently can do so with some of the seal materials in vehicles.
None of the other OAT or HOAT type coolants use 2-EHA, it is unique to
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