2003 Buick Century Owner's Manual - Page 237

Checking the Fluid Level Prepare your vehicle as follows: Park your vehicle on a level place. Keep the engine running. a Then, without shutting off the engine, follow these steps: 1 With the parking brake applied, place the shift lever in PARK (P). With your foot on the brake pedal, move the shift lever through each gear range, pausing for about three seconds in eachrange.Then, position the shift lever in PARK (P). Let the engine run at idle for three to five minutes. I The automatictransaxle fluid dipstick handle is the black loop located toward the rear of the engine. 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. 5-20