Volkswagen may outsource production of some of its best-selling cars in China to relieve pressure on a Shanghai plant working overtime to keep pace with soaring car sales, a spokesman told Reuters. Shanghai Volkswagen, a joint venture plant, made 32,200 cars in April, up 25% on the year, the spokesman told the news agency. Sales in the first four months jumped 80% to 128,214, but that was markedly slower than the market's overall expansion.