I think the petrodollar has been given more weight than it deserves. The dollar's utility enabling international trade has more to do with the stability, freedom and general availability, than with the US enforcing it in any way.
Not quite.
You should look, for example, into the events of 1971, specifically, US policy regarding foreign exchange rates. Using dominant US dollar position, the US has achieved re-evaluation of exchange rates favoring US exports. As a concrete example, US Treasury Secretary drove the pressure to open European agriculture markets to US exports, weakening European farming industry in the process. Similar moves were made against Japan and South Korea.
