"What are the most common problems with the 1996 Cadillac Fleetwood's Northstar engine?"

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Accepted Answer

The 1996 Cadillac Fleetwood’s Northstar engine is prone to several well-documented issues, including:

1. **Head Gasket Failures**: Aluminum heads and composite gaskets often fail, causing coolant mixing with oil or overheating. 
2. **Oil Consumption/Leaks**: High oil burn rate and rear main seal leaks are common. 
3. **Timing Chain Tensioner Issues**: Hydraulic tensioners can fail, leading to catastrophic chain slack. 
4. **Coolant System Vulnerabilities**: Water pump/hose failures increase overheating risk, worsening other issues. 
5. **Transmission Quirks**: Some models report erratic behavior, though less frequent than engine problems.

For further details, see [Northstar Engine Wikipedia](https://en.wikipedia.org/wiki/Northstar_engine_series) or [Classic.com’s Fleetwood Market](https://classic.com/m/cadillac/fleetwood/2nd-gen/).

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