Oldsmobile 2004 Silhouette - Manual (Page 323)

Then, without shutting off the engine, follow these steps:
The dipstick is located toward the back of the engine
compartment, next to the brake master cylinder
reservoir.
The dipstick has a bright, red loop design for easy
identification. See
Engine Compartment Overview on
page 5-12 for more information on location.
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.
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.
5-21