Buick 1998 Century Owner's Manual page 278

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In heavy traffic
--
especially in hot weather.
While pulling a trailer.
To get the right reading, the fluid should be at normal
operating temperature, which is 180°F to 200°F (82°C
to
93°C).
Get the vehicle warmed up by driving about 15 miles
(24 km) when outside temperatures are above 50°F
(10°C). If it's colder than 50°F
( 10°C), you may have
to drive longer.
Checking the Fluid Level
Park your vehicle on a level place. Keep the
engine running.
With the parking brake applied, place the shift lever
With your foot on the brake pedal, move the shift
in PARK (P).
lever through each gear range, pausing for about
three seconds in each range. Then, position the shift
lever in PARK (P).
Let the engine run at idle for three to five minutes.
Then, without shutting off the engine, follow
these steps:
The automatic transaxle fluid dipstick is the red loop
located toward the rear of the engine.
1. Pull out the dipstick and wipe it with a clean rag or
paper towel.
then pull it back out again.
2. Push it back in all the way, wait three seconds and
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