Nigeria will launch exports of a new crude grade in March as OPEC’s biggest African oil producer looks to boost output and exports and seek a higher baseline in the OPEC+ agreements. The national oil company of Nigeria will start shipping the Cawthorne grade, a type of sweet crude similar to the country’s flagship Bonny Light crude, a spokesperson for NNPC told Reuters on Tuesday. The first loading of the new crude variety is set to take place in the third week of March, a source with knowledge of the plans told the publication. Cawthorne…