methods and apparatus for enhanced and improved viscous oil recovery are disclosed . a horizontal well is drilled through the viscous oil formation . a liner includes temperature actuated valves for delivering steam more uniformly along the heel and toe portions of the liner . the temperature actuated valves include an actuation mechanism that actuates from an open position to a closed position to control the flow of the steam therethrough . the actuation mechanism actuates to the closed position when it exceeds a predetermined temperature . heat from the steam mobilizes and lowers the viscosity of the heavy crude wherein the crude is then produced to the surface via conventional lift arrangements .