Striking designs like this A5 coupe have helped Audi find sales growth around the world. Photo credit: Audi

German auto giant Volkswagen (NASDAQOTH:VWAGY) is set on an ambitious goal: Becoming the world's largest-selling automaker by 2018. VW's luxury brand Audi, and Audi's massive profits, are a big part of that plan -- and Audi has set its sights on overtaking the current luxury-car leader, BMW (NASDAQOTH:BAMXF).

BMW is a fierce competitor, with top-notch products and a superb brand. Can Audi close the gap? In this video, Fool contributor John Rosevear checks in on Audi's latest sales figures -- and sees some trends that should have BMW's leaders worried.