Pontiac 2004 Montana Owner's Manual page 363

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.
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