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I have a Toyota Camry with an automatic transmission with a shift knob to force the maximum gear, i.e. if I move it to 3rd, it'll only choose among gears 1, 2, 3, but not 4 or 5. When going downhill I can shift to one of the lower gears to slow down the car without using the brakes. Is it bad...

My friend/mechanic recommends me doing a "partial" ATF change, i.e. without pumping out all old fluid, hence maybe half or a third of the old fluid in the transmission would stay and be mixed with the new fluid. He himself do this to his car every 30K miles. Is it good/bad, what do you think...