Overdrive Switches

courtesy of Bob, The Auto Answer Man

My question is about the overdrive switch. What does exactly that switch do? Is it better to turn it off while you're not driving too fast (surface street, in traffic, etc.) or better have it on all the time? Is it harmful to turn it on and off frequently? BTW, I own a 1985 Toyota Camry with 150,000 miles on it which is still running satisfactorily.
Andre J. of Garden Grove, CA

Basically that switch turns off the overdrive on the transmission. The only time you really need to use it is when going up a hill or when towing something. Other than that, the transmission should be able to select the correct gear for the speed you are driving.
Good Luck!
Drive Safely!
Bob, The Auto Answer Man

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