BHP Billiton and DEA Deutsche Erdoel are hopeful that the slowdown in bid rounds is a feature of Mexico's political transition and won't be permanent. (Bloomberg) -- Mexico’s oil auction winners BHP Billiton Ltd and DEA Deutsche Erdoel AG are hopeful that the slowdown in bid rounds is a feature of the country’s political transition and won’t be permanent."We have expectations that things will pick up again and continue,” said DEA Deutsche chief executive officer Maria Moraeus Hanssen. The company expects to start wells in Mexico in . . .