Experts don't consider the Saudi oil reserves claims reliable. The figures are pretty much made-up - no foreigner really knows how much oil they have.

About "ally"; I remarked years ago that Americans tend to use that word inflationary. That is dangerous, for at times people really believe that a nation with which you had some agreements and which was called an "ally" is really allied - with obligations and all. See Georgia and the nutty idea that they were an ally and the U.S. should somehow intervene...
The inflationary use of the word "ally" also leads to delusions in the "allied" country (again; Georgia!).


Btw; the German government proved its lack of taste, judgement and class in regard to Saudi Arabia just a few weeks ago.