I had a mechanic a Laramie Wy Ford tell me that they have been having tons of turbo failures in their Fords due to the ULS diesel fuel because it does not have the lubrication the engines need.
Jim, find another Mochanic, sounds like he is just repeating something he heard somebody else say and he doesn't understand Fords TSB 06-4-12, 06-23-16 if he read it at all. Turbo problems are caused by coking and carbon buildup and can be caused by many things.
Coking (carbon) Deposits in Turbo and/or EGR Valve:
Coking deposits are usually a build up of unburned fuel or oil in the exhaust system and related components (valves, turbo, EGR valve). This can be caused by poor fuel quality, overfueling/leaking injectors, idling for excessive periods of time (especially in cold ambient temperatures), low engine operating temperatures, injection timing (calibration) or oil consumption. Unburned fuel usually appears as white smoke, but over time the coking condition can result in excessive black smoke. Coking depositis can plug the EBP sensor tube, foul the EBP sensor, cause the EGR valve to stick open, block the EGR cooler, plug the MAP (boost) sensor hose, or cause the variable turbo vanes to stick open (no power/boost) or closed (excessive backpressure, black smoke, popping noise, bucking). The cause of the coking issue should be identified before replacing parts to prevent reoccurance. If poor fuel is suspected, use Stanadyne Performance or Motorcraft PM-17-A Cetane Boost. TSB 06-4-12, 06-23-16.
Hey found Fords position on Biodiesel perusing the TSB bulletins
Ford's Position on Biodiesel:
Ford is advising that any of their vehicles powered by a diesel engine, regardless of manufacturer, may exhibit engine or fuel system problems when using fuels with greater than 5% Biodiesel. Any problems when using fuels containing more than 5% Biodiesel should be referred to the fuel manufacturer. Ford only recomends using fuels containing no more than 5% Biodiesel (B5) in their diesel powered vehicles. In addition, as per World Wide Fuel Charter (WWFC) catagory 1-3, fatty acid methyl esters (FAME) must meet EN14214 and ASTM D 6751 specifications. Broadcast Message 0884, 3626, 4942.
It is also recommended to change the oil using the severe duty schedule (3000 mile; no later than 5000 miles) and replace the fuel filter every other oil change (no later than 10,000 miles)