Preparation of heat stable silicone fluids

A method for preparing a heat stabilized silicone fluid which comprises adding to a silicone fluid having the general formula ##STR8## in which R is a monovalent hydrocarbon radical having from 1 to 18 carbon atoms, X is a radical selected from the group consisting of a monovalent hydrocarbon radical and a radical of the formula --OR, where R is a monovalent hydrocarbon radical having from 1 to 18 carbon atoms and n is a number greater than 10, an aminofunctional silicone fluid in an amount of from 10 to 50 percent by weight based on the total weight of the silicone fluid and the aminofunctional silicone fluid, said aminofunctional silicone fluid is a tertiary aminoorganosiloxane of the formula ##STR9## where A is selected from the group consisting of monovalent hydrocarbon radicals having from 1 to 18 carbon atoms, hydroxy terminated polyalkylenoxy groups, alkenyloxy terminated polyalkyleneoxy groups, hydroxyalkyl groups, tertiary aminoalkyl groups and divalent groups which together with the nitrogen atom forms a heterocyclic ring containing only carbon and nitrogen, with hydrogen as the only substituent on the ring or only carbon, nitrogen and oxygen with hydrogen as the only substituent on the ring, R is a monovalent hydrocarbon radical having from 1 to 18 carbon atoms, R' is selected from the group consisting of hydrogen and monovalent hydrocarbon radicals having from 1 to 18 carbon atoms, a is a number of from 0 to 2, c and d are each numbers of from 1 to 10 and e is a number of from 0 to 2, said tertiary aminoorganosiloxane is obtained from a platinum catalyzed addition reaction of an alkenyl ether of a tertiary hydroxyalkylamine and a silicon compound selected from the group consisting of silanes and siloxanes containing silicon bonded hydrogen.