This information applies to 2005 Buick Terraza, Chevrolet Uplander, Pontiac Montana SV6 and Saturn Relay.
These vehicles may have a large, repeat rear main oil seal leak which may not be easily duplicated while vehicle is idling. The leak may be present only while vehicle is being driven.
The rear main bearing may exhibit excessive clearance, caused by excessive bearing wear. This may be aggravated by high-end engine RPM limitations related to valve spring oscillation/float as described in bulletin 05-06-01-036.
1. Verify engine oil is at proper level, not overfilled.
2. Verify proper operation of the crankcase PCV system.
3. Replace rear main bearing.
4. Replace rear main seal following bulletin 05-06-01-019B, and utilizing the new service tool described in the bulletin.
5. Replace all valve springs using p/n 12599294 as detailed in bulletin 05-06-01-036.
- Thanks to Ronald Mitchell
These vehicles may have a large, repeat rear main oil seal leak which may not be easily duplicated while vehicle is idling. The leak may be present only while vehicle is being driven.
The rear main bearing may exhibit excessive clearance, caused by excessive bearing wear. This may be aggravated by high-end engine RPM limitations related to valve spring oscillation/float as described in bulletin 05-06-01-036.
1. Verify engine oil is at proper level, not overfilled.
2. Verify proper operation of the crankcase PCV system.
3. Replace rear main bearing.
4. Replace rear main seal following bulletin 05-06-01-019B, and utilizing the new service tool described in the bulletin.
5. Replace all valve springs using p/n 12599294 as detailed in bulletin 05-06-01-036.
- Thanks to Ronald Mitchell
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