With the engine warmed up, leave the car idling in park on a level surface. Pull out the dipstick, wipe it clean, replace it slowly, and then pull it back out. … The color of transmission fluid can tell you a lot about the health of your car’s transmission.
Do you add ATF with engine running?
Your car’s engine should be running when you add fluid to the transmission, but you should have the transmission in park and the handbrake activated for safety. Check the owner’s manual for instructions on selecting the correct transmission fluid for your vehicle.
Does engine need to be running to check oil?
Answer. We recommend checking the oil level either before turning on the engine or 5 to 10 minutes after shutting down so you can have all the oil in the oil pan to get an accurate measurement.