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I've had a 10 -25 degree delta between EOT and ECT this Summer. They ran identical all Winter and Spring air temps were above 80 deg F. I ordered - Performance Machine Coolant Filter Kit - 1 gallon Restore coolant flush - 1 gallon Restore plus coolant flush - two F108N Fumoto drain valves -...

The last couple weeks I have noticed the EOT creeping up when the air temps get 85 deg F or above. The highest was running 80 mph into a 20 mph head wind the ECT got up to 204 deg F and the EOT got up to 218 deg F. These temps are read on a Banks tuner with a PDA plugged into the diagnostic port...

I just bought this Excursion today. 03' Limited with 6.0. 167,000 miles. Engine replacement by Ford dealer at 120,000 miles in 09'. Bone stock.