BMW has stopped deliveries and is set to recall some newly built 2013 M5 and M6 performance cars, due to an engine oil pump problem that could lead to severe engine damage, Reuters has reported. The German automaker said it found a "manufacturing defect" in the oil pump through its quality checks. The affected models were built this year between July and September. The recalled cars are equipped a turbocharged 4.4-liter V8 engine that BMW internally calls the S63Tü. "Because of this potential, BMW and its dealers will stop delivery of all affected vehicles until the recall repair has been completed," BMW said, without saying how many cars are affected by the action.