Mapu amtundu wamafuta a Dr ndioyenera kutsutsana ndi mitundu yopanda mafuta, yolimba kapena yokhumudwitsa - Njira zopangidwa ndi mafuta. Gulu lililonse lalikulu limapereka mitengo yambiri yotuluka, yosinthira yotsitsimutsa, ndi magetsi. Kusintha kwa kupanikizika (njira zosankha) zitha kukhazikitsidwa mkati mwa mapampu yopaka monga momwe akufunira. Ngati makina otsogola alibe PLC, mapampu yolingana ndi mafuta omwe ali ndi wolamulira ayenera kusankhidwa.