Question about overdrive button...

[VinceSez]

I've searched through the forums and read about the overdrive button, but I wanted to get something straight. I should only turn O/D off when I'm in the city, but when I'm on the highway for example, I need to turn it on? The reason why I'm asking this is because when I first bought my car in Feb, the O/D button was off. Am I hurting my engine with it off?

Thanks in advance

[scruffy63]

when its on you have 5 gears when its off you have 4 gears. when its on you are lower in your rpms. when its off you are higher of course. you are not hurting your car, just your wallet in gas money.

[VinceSez]

I see, thanks...