It seems that owners would park the car in the garage and go in the house and after several minutes the car would catch fire and in some cases burn the house down!
The GM fools improperly designed the head gaskets on the one bank of the V6 that leans forward and it would leak oil onto the hot exhaust manifold but ONLY after the engine was turned off. Go figure.
A new, improved gasket and an additional flange seems to have worked, at least on my GS, which I still drive.
But that is the exception in gas vehicles to be sure!
Yes, indeed, Government Motors "engineers" are prone to such...