General Motors Corp. recalled more than 313,000 Saturn, Pontiac and Cadillac vehicles around the globe to fix a rear-axle seal that may leak and cause the cars to lose control and crash. In the United States, the recall covers 275,936 Saturn Sky, Pontiac Solstice and Cadillac CTS, CTS-V, SRX, STS and STS-V vehicles from the 2005-07 model years, according to the National Highway Traffic Safety Administration's Web site. It is GM's biggest domestic recall in 2007. A fluid leak in the rear-axle pinion seal may cause the vehicles' rear differential to lock up, possibly causing a loss of control, GM said in a Dec. 19 letter to NHTSA. According to GM, two crashes were reported; one involved an injury. The recall stems from a preliminary inquiry that NHTSA began in July after receiving 20 reports from motorists of rear differential failures. Almost all the complaints cited the back wheels of the vehicles locking up, the agency said.