Crankcase ventilation and oil leaks
M176Oil leaks around the cam covers, the oil cooler or the sump, often with no single obvious source.
The widespread oil leaks on the 4.0 V8 are usually the PCV oil separators rather than the cylinder head. When a separator clogs, crankcase pressure rises and pushes oil past whichever gasket is weakest. Replacing gaskets without fixing the separator buys the same leak again.
Parts this needs
Checked against go-parts.com

