When I took my Malibu in for service, the advisor asked if I wanted to change the transmission fluid. I asked something along the lines of "isn't it supposed to be lifetime? and he answered along the lines of what you said.An '03 Solara is a pretty conventional slushbox that could benefit greatly for a fluid change--unless if you are ok with the transmission dying with its "lifetime" fluid in it--thought differently, lots of engines have lifetime oil in them, they will run until they don't, and the oil will have made it to the end of the lifetime of the engine.
