[imtringued]

That's completely insignificant compared to having the dollar as the global currency in the oil trade. Countries that sell oil for dollar can only spend those dollars on American products. It's as if the USA produced all the oil in the world and sold it for profit. Meanwhile Germany's unfair advantage is that it's prices on products are slightly lower than they should be.

[AdrianB1]

It is actually the other way around: this keeps the US dollar artificially high, hitting on exports, and it is completely not true that these countries can only spend dollars on American products: they can spend on anything they want, the dollar is just a currency, you can use it to buy products from Russia, China or Nigeria.