Answer from Simple Green:
A Ford Tech Bulletin calls for "Simple Green Heavy Duty Cleaner/Degreaser" for flushing grease/oil out of a diesel cooling system. WE recommend any of the following (all are same chemistry)
Simple Green Heavy Duty Cleaner/Degreaser (avail. through Sherwin Williams)
Simple Green Pro HD Heavy Duty Cleaner/Degreaser (avail. at Hme Depot)
Extreme SImple Green Aircraft & Aviation Cleaner/Degreaser (through industrial distributors such as Grainger, Fastenal, and MSC Industrial.
Here is reference to the Ford Bulletin. For a full copy of the bulletin or for questions, call Simple Green Customer Service at 800-228-0709, 8am-5pm Pacific. Thanks!
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6.0L DIESEL COOLING SYSTEM CONTAMINATION TSB 08-23-1
FLUSH PROCEDURE
FORD: 2003-2007 F-Super Duty
2004-2008 E-Series
2003-2005 Excursion
ISSUE
Some 2003-2005 Excursion, 2003-2007 F-Super
Duty and 2004-2008 E-Series vehicles equipped
with a 6.0L engine may experience engine oil,
transmission fluid or diesel fuel contaminating the
cooling system. This flushing procedure is to be
performed after the source of the cooling system
contamination has been identified and repaired.
ACTION
Follow the Service Procedure steps to correct the
condition.
SERVICE PROCEDURE
Figure 1 - Article 08-23-1
Follow the steps in sequence to effectively repair
the vehicle:
• Drain cooling system contaminates.
• Clean cooling system with Simple Greenâ Heavy
Duty Cleaner and Degreaser.
• Clean cooling system with Motorcraftâ Engine
Cooling System Iron Cleaner.
NOTE
ALL STEPS MUST BE COMPLETED IN ORDER
TO PROPERLY CLEAN THE COOLING SYSTEM.
ANY DEVIATION FROM THE SERVICE
PROCEDURE WILL RESULT IN SHORTENED
COOLANT PROTECTION AGAINST CORROSION
IN THE COOLING SYSTEM.