Hydrocarbonoxy-containing silicone fluids useful as hydraulic fluids

A silicone fluid useful as a hydraulic fluid consisting essentially of a polymer having 75 to 95 mole percent by weight of polymeric units selected from the class consisting of from ##STR22## and R.sub.2 SiO units and mixtures thereof, 5 to 25 mole percent of polymeric units selected from the class consisting of ##STR23## and RSiO.sub.3/2 units and mixtures thereof with trace amounts of other units selected from the class consisting of (MO).sub.3 SiO.sub.1/2 units, (MO).sub.2 SiO units, MOSiO.sub.3/2 units, SiO.sub.2 units and R.sub.3 SiO.sub.3/2 units and substantially free of disiloxanes, wherein the molar amount of MO groups present based on the total moles of R and MO groups present may vary from 5 to 95 mole percent, wherein the viscosity of the polymer may vary from 2 to 400 centistokes at 25.degree. C, R is a lower alkyl radical, M is selected from the class consisting of ROR'--, ROR'OR'--, and R(OC.sub.x H.sub.2x).sub.n -- such that R is as previously defined, R' is selected from the class consisting of alkylene and arylene radicals of 1 to 10 carbon atoms, x varies from 2 to 4 and n varies from 4 to 100.