Originally Posted By: dblshock
now the car will be used heavy in harsh rural WI winters and bi monthy 500mi. trips downstate.
is the nature of this LIM failure a sudden catastrophy?
Well, yes! No one can answer as to when the gasket will decide to fail. Some gaskets never fail in 200,000 miles but, GM had more than it share of issues with these engines with the intake manifold gasket as well as the head gasket failures in the 2.8L, 3.1L & 3.4L. Even the famous 3.8L had some issues in certain years, unfortunately!
Do the flush and fill and go from there! If it fails, get it fixed then. It may never happen! Look for signs of coolant loss over time but, no sign of coolant leakage on the ground. Most likely the coolant will go through the exhaust system.
IDK if I said that right!