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Been my experience with GM 4.3 Vortec the plastic lines to and from the injector crack and cause this problem.There under the intake plenum and allow raw fuel to enter the crank case!
Hope this helped!!
Have a Nice Day!! GMJ
are you talking about the key cylinder or the ign switch. To remove the cylinder or the ign switch you need to remove the covers around the steering wheel. The switch is bolted in with to e8 torx. The cylinder is removed after you remove the covers buy putting the truck into drive with the engine off. Then turn the key to crank(will not crank because in drive) and there is a small hole above the cylinder. Using a small pick paper clip you push it in the hole. That releases the cylinder.
cornejo1971: There is no crank case oil breather per say. There are two PCV valves on the engine. There is one located on the intake plenum on each side. Typically there are hoses which come off the tops of the valve covers that go to the PCV valves.
If it is milky it is coolant due to bad head gaskette.
If it looks like durt oil needs to be changed.
You can also check the oil dip stick fo deposition.
Please let me know if you need more info. I am here to help