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The Hummer Knowledge Base
Oil Leaks - Tracking Them Down:
Possible causes of oil leaks:
- Oil pressure sending unit
- Oil Pressure sensor
- Faulty engine oil cover cap
- Valve cover gaskets (common source of leaks on 5.7L Diesel engines)
- Head gasket
- Oil filter attachment point
- Oil pan gasket
- Oil pan bolt
Pressure clean the engine after spraying it with Gunk. Then most auto parts stores sell a leak detector kit where you add a fluorescent dye to the oil, run the engine, then examine it with UV light. This is how to detect difficult leaks.
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