3.8 water in engine from EGR cooking the manifold
I have had this same issue on both of my Parks, a 97 at about 80,000 and now my 98 with 43,000 on it. Both times the dealers have told me it was a very common issue due to the small hole for the EGR to pass through, this latest guy said they have now improved the manifold with a larger hole. I have to wonder why there has never been a recall on this, it is a persistent problem that I feel Buick should pay for. All said and done with an oil change it cost me $645.00, about the same both times!