Join Date: Oct 2010
Location: SE Texas
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Quick Background-2004 6.0. Std. Transmission. Truck weighs approx. 13,000 lbs with the service body. Have an edge insight CTS, but otherwise bone stock.
After I replaced my stuck thermostat last year my ECT was about 190*, EOT was ~200*. Lately I have been noticing that my EOT has been creeping upwards of 210*...up to as much as 215*. ECT has also been creeping up, to about 197*. As part of my PPM I replaced the radiator last week, now engine temps are staying around 190*. Temps stay down on slow driving, but on 20-30 minute trips at highway speeds (55 mph + ) the delta starts to climb.
Still running stock Ford Coolant, no coolant filter. Oil cooler was changed under warranty according to the oasis report about 80K (I am second owner). I cleaned the EGR about 5K ago, didn't notice any moisture in the manifold.
Is it too late to flush and go to ELC with a coolant filter, or did I screw up and let the oil cooler get plugged again? We have been having really hot temps here in Tx the last few weeks (95*+ ambient) if it makes a difference.