Blue Planet Studio/Shutterstock Sentiment improves on lower freight costs and pickup in Chinese refinery appetite.Market awaits Nigeria's official selling prices.Angola's exports in March fall to a multi-year low. Save for later Print Download Share LinkedIn Twitter The outlook for West African crude is improving as the market gears up for trading in June loading cargoes. Some sellers are hiking offers in anticipation that lower freight costs and a revival of Chinese demand will stimulate more purchases.