Workers at Nigerian National Petroleum Corp., the country’s state-owned oil company, began an indefinite strike that may disrupt crude output from Africa ’s top producer and affect its domestic gasoline supplies, a union official said. “We have total shutdown at NNPC offices and all their subsidiaries, and that may affect the exports,” Babatunde Oke, a Lagos-based spokesman for both a managers’ union and a blue-collar workers’ union, said by phone today. “The refinery workers are also not working.” Staff operating flow stations that pump crude to export terminals are joining the action, meaning a protracted strike could disrupt cargoes, Oke said. Domestic gasoline supplies may also fall short as the workers protest pension terms at NNPC, he said. Union leaders should “exercise restraint,” the state-owned company said in a statement. Measures have been taken to reduce the pensions’ deficit to 85 billion naira ($520 million) currently from 298 billion […]