Plinsko olje, ki ima plamenišče enako ali večje od 55° C in je namenjeno za obdelavo z vakuumsko destilacijo, da bi tako zvišali njegovo plamenišče, s čemer bi se zagotovilo, da plamenišče končnega proizvoda, kot posledica prevoza, po vstopu v prost obtok, v rezervoarjih, ki so lahko kontaminirani, ali ki mu je bil dodan kerosin, da bi bil proizvod bolj tekoč, ne pade pod 55° C, kar je minimum, ki se na splošno zahteva za trženje proizvoda kot plinskega olja, se uvrsti v kombinirano nomenklaturo, kakor sledi:
A gas oil, having a flash-point equal to or above 55 °C for undergoing a process of vacuum distillation in order to raise the flash-point so as to ensure that, resulting from its transportation, after its entry into free circulation, in tanks which may be contaminated or following the addition of kerosene to increase its fluidity, the flash-point of the finished product does not fall below 55 °C which is the minimum generally required for marketing the product as a gas oil, shall be classified in the combined nomenclature, as follows: