have 06 6.0 w/ 100K miles. noticed that I am losing coolant in my res. tank. no white smoke out the exhaust. truck running great. eng temp and oil temps 5-15 degrees off. had a pressure test for head gaskets, and it passed. any ideas? was thinking of flushing and putting Amsoil antifreeze in. any help is appreciated.

 

Hey Brian -suggest you go down to the 6.0 diesel forum for your answers....6.0L Power Stroke Diesel - Ford Truck Enthusiasts Forums

 

I had coolant tank cracked at the bottom this summer. It was spraying only under high pressure so I could not see it for some time. Than after removal the crack at the underside was quite clear.