This standard describes a procedure for the measurement of inherent stability of middle-distillate petroleum fuels under accelerated oxidizing conditions. It is not applicable to fuels containing residual components, or any significant component from a non-petroleum source. It provides a basis for the estimation of the storage stability, under the conditions of this test, of middle-distillate fuels with an initial boiling point above approximately 175 °C and a 90% (V/V) recovery point below 370 °C. TOST Classic, test container, mushroom condenser with horizontal barbed fitting, oxygen delivery tube