I have a 2007 Honda Accord with automatic transmission and live in an area where there are a lot of hills. Is it okay to manually shift from D to 3 or 2 when the car is in motion to slow its speed going downhill or when coming to a stop or will it cause premature wear and tear?
Look In Your Owner’s Manual !
Downshifting is ok to manage your speed on long hills, but its not something to do as you come to a stop.
Downshifting is fine, just dont drop it down if you are doing 80 mph
texases is right. The only reason to do it is on long downhills or very steep, slow downhill runs. Gearing down to stop is not advisable. About only time I used the shifter in an automatic is to gear down in preparation for blasting out of a low speed turn when I am in a hurry. It is particularly useful to avoid the awkward lurch on uphill tight turns.
And it is a good idea to lock out the overdrive while driving in hills. I don’t mean on the freeway.