1999 Cadillac STS



April, 13, 2010 AT 3:51 PM

Engine Mechanical problem
1999 Cadillac STS V8 Front Wheel Drive Automatic 86000 miles

I know pre 2000 northstar engines are famous for blown head gaskets, but my question is what is the permanent fix? Would replacing the head gasket be worth the hassle or should I go with a used engine.

1 Answer



May, 19, 2010 AT 11:15 PM

Your best bet would be replacing the head gaskets, and at the same time installing thread inserts in the headbolt holes. It is the threads that fail resulting in an internal leak, the gaskets were never the root cause. I have seen next to none fail after having the threads repaired, and there were times where we performed 3-5 of these repairs a week. The problem with a used motor, you may be faced with the same problem at some point in time. There is no way to tell if the threads have been repaired unless the engine is torn down.

Please login or register to post a reply.

Spark Plug Replacement Toyota Corolla 2000-20
Coolant Temperature Sender Replacement