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Originally Posted by DEI37
It's probably worth replacing. Those are good cars, and the engines are usually good. That's surprising that it did something like that so early. Usually, they go 250,000 miles or so. I know that the SeriesII engines had a composite intake manifold that would crack and leak coolant in to the oil. That's obviously a bad thing. I can't remember if yours is SeriesII or not, though.
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Oh yeah, the dreaded plastic intake manifold.
My 97 Series II plastic intake manifold cracked and destroyed the engine. The coolant mixed with the oil and killed the big end connecting rod bearings.
The series II came out with the plastic intake manifold in 96, so our original poster doesn't have that problem.
Personally, if you could fix the car yourself, cool. But an 11 year old Bonneville isn't worth very much. (Not to be cruel, just truthfully.)