Volkswagen (NASDAQOTH:VWAGY) has made no bones about its ambition to be the world's new-car sales leader by 2018. To get there, it will have to lean heavily on its mainstay VW brand -- but sales of VWs have faltered lately.

In this video, Fool.com contributor John Rosevear looks at the latest sales numbers for VW from around the world -- and at the German auto giant's chances of passing General Motors (NYSE:GM) and Toyota (NYSE:TM) to take the auto sales crown.