SAO PAULO/LONDON—Brazil’s epic “Car Wash” corruption investigation has taken down presidents and elite businessmen, and led to the largest corporate leniency deal ever signed.
But graft allegations lodged by prosecutors last week against four of the world’s largest oil trading companies - Vitol SA, Trafigura, Glencore PLC., and Mercuria Energy Group—have opened an explosive new phase in the long-running probe.
