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Point him to oil cooler failures on this site.
Long story short - get an aftermarket gauge set that will allow for the display of oil and coolant temperatures.
If oil temp > coolant temp + 14 then oil cooler must be replaced otherwise other ugly things will follow.
Motor may run great but still be suffering from a plugged oil cooler.
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Just one more 2004 6.0L owner
Edge Insight display
bulletproofdiesel oil transfer block
bulletproofdiesel oil cooler
dieselsite coolant filter
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