My dad's construction company purchased 4, 6.0 for fleet service trucks back in 2006. The only thing that ever was done to them was fluid maintenance (oil , coolant, etc...). The coolant was drained every winter and replaced with new Ford Gold coolant. The trucks have over 250,000 miles and never had the EGR, oil cooler, or head gaskets replaced.
The key is replacing the coolant yearly. The coolant breaks down and the silicates fall out of suspension and plug up the oil cooler, which then takes out the EGR cooler, which then takes out the head gaskets. The high pressure oiling system needs some attention; new oil rail plugs, and the updated STC fittings will fix those issues.
Then the FICM will go out eventually. There are many sources to fix the power side of the FICM from going out.
Keep the oil changed every 5,000 and switch to 5W-40 to keep the injectors happy.
The 6.0 can be a nasty engine with SCT tuning and all the "fixes" done...
The key is replacing the coolant yearly. The coolant breaks down and the silicates fall out of suspension and plug up the oil cooler, which then takes out the EGR cooler, which then takes out the head gaskets. The high pressure oiling system needs some attention; new oil rail plugs, and the updated STC fittings will fix those issues.
Then the FICM will go out eventually. There are many sources to fix the power side of the FICM from going out.
Keep the oil changed every 5,000 and switch to 5W-40 to keep the injectors happy.
The 6.0 can be a nasty engine with SCT tuning and all the "fixes" done...