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Oil cooler needs replacing if the EGR cooler has failed. Look at ECT and EOT and beat on it -- if the oil temp exceeds the coolant temp by 15*, the oil cooler is restricted and must be replaced.
Yes, heads may also be damaged.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.