You don't need to do nothing. In the states, one is used for winter and the other is used for summer. You don't need to do a thing to the engine before using one or the other. I'm a trucker.
A few years ago most European cars wouldn't run on American diesel because of the extra sulfur. If it's got a particulate filter, the extra sulfur can be an issue.
But because American diesel is of worse quality than European, that Ford shouldn't have problems with Kuwaiti diesel. If it were a European truck, I wouldn't risk.