I would also be worried about all of your hoses that have coolant running through them. They may swell due to coming into contact with oil once you start doing a thorough flush to get the oil out when the car is running and circulating coolant through the system.
At the Ford dealership that I work at, diesel fuel got mixed in with a 6.0's coolant. We had to do a thorough flush like others have mentioned. We had to also replace all hoses that have coolant going through them and the thermostat as well. The coolant hoses swelled up like a mofo. Something to think about.
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Ford Diesel and Heavy Line Technician at your service. 
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