Had to replace intake manifold due to it being made of "plastic". Antifreeze leaking into engine because of this
2 Months later the bearings in the crank seized, mechanic took engine apart only to realize how much corrosion damage was done to the engine from the antifreeze going through it. This cost me another $1200.00. I strongly agree with everyone else on here. G. M knows that the intake manifold was defective on there cars and there should have been a recall on them. Very disappointed in G.M. Previously owned a '88 Bonneville, best car I ever owned it also had the 3800 series motor in it and got over 280,000km and still running so I purposely looked for a G. M with the 3800 series motor in it when I bought this car, they definitely let the quality of their engines go down the tubes in recent years and they don't care about their customers at all. Just bought a 2001 Dodge Caravan hope I have better luck with that.
I will never buy a G. M product again.