Buick 2000 Regal Owner's Manual page 265

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.
2. Push it back in all the way, wait three seconds and
then pull it back out again.
6-22
3. Check both sides of the dipstick, and read the
lower level. The fluid level must be in the
-
cross hatched area.
4. If the fluid level is in the acceptable range, push the
dipstick back in all the way.