1998 Pontiac Bonneville SLE from North America - Comments

My daughter's 98 Bonneville had the exact same problem at 100,000 miles. It cost $500 to fix and clean out the engine. It's only a $200 fix if you fix it BEFORE you have a problem!

1995 Buick Park Ave Ultra. No problem with manifold as the supercharger is all metal. However my leak was the timing chain cover. Coolant destroyed the bearings. I replaced the engine with a remanufactured one from Jasper (Jasper, Indiana) for a cost of over $5,000 installed. I guess Jasper remedies all the GM defects when they remanufacture an engine.

But this was after I spent considerable amounts replacing other engine gaskets, made of cheap plastic, which got brittle over time etc. Another example of GM product defects. The basic 3800 engine is solid, the problem is other cost cutting short cuts that have harmed GM's reputation.