Only a month after it first went on sale in Europe and a week in the U.S., BMW's brand-new 5-Series sedan, codenamed F10, is sold out in all-markets with customers having to wait up three to four months for deliveries, according to company officials."The 5-Series is at the core of the BMW brand and we knew it was going to be a very strong vehicle for us," said Ian Robertson, BMW's sales boss,