When checking the automatic transmission fluid, most transmissions should be

When checking the automatic transmission fluid, most transmissions should be

• A. At normal operating temperature and the engine running
• B. When cold with the engine off
• C. After driving 30 minutes at idle
• D. Whenever convenient during maintenance

Answer: (A)

ATF level is read most accurately when the fluid is at its normal operating temperature and the engine is running. The transmission fluid expands as it heats and is circulating when the engine runs, so this condition reflects the true fluid level during normal operation. If you check with the engine off or when the fluid is cold, the dipstick will show a lower reading than the actual level once the transmission is warm, leading to an incorrect assessment. To get a correct reading, warm up the vehicle to normal temperature, park on level ground, keep the engine running, and follow the vehicle’s procedure for reading the dipstick. This ensures the level shown corresponds to the amount of fluid the transmission actually needs during operation.

ATF level is read most accurately when the fluid is at its normal operating temperature and the engine is running. The transmission fluid expands as it heats and is circulating when the engine runs, so this condition reflects the true fluid level during normal operation. If you check with the engine off or when the fluid is cold, the dipstick will show a lower reading than the actual level once the transmission is warm, leading to an incorrect assessment. To get a correct reading, warm up the vehicle to normal temperature, park on level ground, keep the engine running, and follow the vehicle’s procedure for reading the dipstick. This ensures the level shown corresponds to the amount of fluid the transmission actually needs during operation.