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Sounds like the engine oil cooler is the problem.The egr cooler does not have oil running through it.
You can just replace the oil rings on it.
It is located on the driver side just above oil pan.No special tools required.Labor less than 2 hours.
Just drain the coolant first.
Is the truck 4X4?
Sorry on that year model the oil cooler is on top of the engine.Click HERE for instructions.