But staying on top will be a challenge for the German maker of the Golf and Polo, as deliveries are falling in China, destination of a third of its global sales, making it overly reliant on relatively stagnant western European demand.
"The hunt for scale only makes sense if it boosts synergies, something VW hasn't really been able to achieve," said Stefan Bratzel, head of the Center of Automotive Management think-tank. "Dependence on China is VW's weak spot and managing such a large group inevitably poses problems."
VW has been pushing for greater scale under Chief Executive Martin Winterkorn's eight-year reign, propelled by adding brands and factories and roaring sales in China.
The German group on July 17 reported 5.04 million deliveries in the first half year. By comparison, Toyota said on Tuesday it sold 5.02 million cars between January and June, a 1.5 percent decline on year-ago levels.