You need to do few things to your 6.0 you need to ditch the Ford Gold junk of a coolant that kills the oil cooler get a coolant filter to remove the casting sand and do a good flush useing Restore and Restore+ then install a CAT EC-1 Rated coolant but first get a good set of gauges to see what your deltas are between ECT-EOT max is 15* i think if you are at 10* doing 60mph on flat ground after 3-4min your coolers are in trouble and the Edge Insight CTS or the ScanGaugeII work well for this.
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