I too have a turbo issue I believe. Its been coming on for the last 10-20,000 miles getting more pronounced. I run about 5,000 miles a week pulling 15,000# (average) RV's around the country so dont let the mileage grab you. I bought the truck @ 56k miles and went immediately into the catastrophic EGR Cooler / Oil Cooler failures up to 143k miles where I thereafter installed a "Custom Diesel" EGR Delete with a new oil cooler as well as a Coolant Bypass filtration system. (All this was bought as a kit all inclusive for around $750). Once I got all those installed I did a coolant system distilled water flush for two days & 50 gallons as recommended on this site by several others, then went with a red 300,000+ mile silicon free coolant. I had an "Actron OBD-II Scanner for deleting the in dash code, but this would not help me monitor water and oil temps needed to track an oil cooler issue. I then got a Scan Guage-II which allows for system specific programming. I am now at 210,000 miles and maintain 4-7 degrees temperature seperation with the exception of long uphill pulls that at times will exceed the 15 degree caution, but this is short lived.
Absolutely awesome with virtually no issue other than Injector Spool Valves and the cost of getting them diagnosed. (FORD cant seem do do it right nor stand by their incorrect diagnosis or return payment for the same) so Ive been looking into software to handle that myself.
03-07 Ford 6.0 Complete EGR Delete Kit with Oil Cooler and Coolant Filtration System
Ford Specific XGauges : Linear Logic : Home of the ScanGauge
But back to the current issue. I bought the truck with a rebuilt Turbo, but have slowly been getting an increase in noise that sounds and I mean absolutely like a power steering pump with exception to turning the wheel to increase the groan. The noise has been there for 40-75k miles but gaining ever so little day by day.
What would be recommended here and yes, it is the turbo, not the power steering pump. Determined by a doctors heart stethoscope.
P.S. I put new Nitto All Terrain Grapplers on about the same time I did the delete. Im putting on another set of Grapplers now.