 
 <prompt> Which one of di tins wey dey follow for pipe no dey pass through pipe: exhaust or asphalt? Based on di question wey dey before, write something wey get di answer. E fit be 1 - 20 sentences. Context: <response>: Asphalt/bitumen dey usually dey store and transport for temperatures wey dey around 150 °C (302 °F). Sometimes diesel oil or kerosene fit dey mixed inside before dem ship am to make sure say e dey flow well; when dem deliver am, dem go comot the lighter materials from the mixture. Dem dey call this mixture "bitumen feedstock", or BFS. Some dump trucks dey pass hot engine exhaust through pipes wey dey the dump body to dey keep the material warm. The backs of tippers wey dey carry asphalt/bitumen, as well as some handling equipment, dey usually dey sprayed with releasing agent before dem fill am to help am release. Diesel oil no dey used again as releasing agent because of environmental concerns. 