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Hi I have a 2004 6.0 single cab with zf6....It runs great pulls hard and no white smoke from the tail pipe...gauges all read normal...I changed the fuel filters last night and thought I would look in the degas tank..It was lined with black sludge and the coolant looks really dark...I was told the oil cooler is bad and probably the radiator and hpop. any help appreciated
 

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If the coolant is black or grey or sludgy than you need to replace your oil cooler and flush the cooling system with restore and restore + to get all the oil and silicate and rust out.
 
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