Oldsmobile 2002 Alero - Manual (Page 90)

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AUTOMATIC OVERDRIVE (D): This position is
for normal driving. If you need more power for passing,
and you’re:
D Going less than 35 mph (55 km/h), push your
accelerator pedal about halfway down.
D Going about 35 mph (55 km/h) or more,
push the accelerator all the way down.
You’ll shift down to the next gear and have more power.
NOTICE:
If your vehicle seems to start up rather slowly,
or if it seems not to shift gears as you go faster,
something may be wrong with a transaxle
system sensor. If you drive very far that way,
your vehicle can be damaged. So, if this happens,
have your vehicle serviced right away. Until then,
you can use SECOND (2) when you are driving
less than 35 mph (55 km/h) and AUTOMATIC
OVERDRIVE (D) for higher speeds.
THIRD (3): This position is also used for normal
driving, however, it offers more power and lower fuel
economy than AUTOMATIC OVERDRIVE (D).
Here are some times you might choose THIRD (3)
instead of AUTOMATIC OVERDRIVE (D):
D When driving on hilly, winding roads.
D When towing a trailer, so there is less shifting
between gears.
D When going down a steep hill.