Should Car Be Running When Adding Transmission Fluid?

The short answer is: no, you should not run your car when adding transmission fluid.

Why Not?

When your car is running, the transmission is under pressure. This pressure can cause the transmission fluid to leak out of the dipstick tube or other openings. Running your car while adding transmission fluid can also cause the fluid to foam, which can lead to inaccurate readings on the dipstick.

How to Add Transmission Fluid

Park your car on a level surface and engage the parking brake.
Locate the transmission dipstick. It is usually located near the back of the engine, towards the passenger side.
Remove the dipstick and check the fluid level. The fluid should be between the “min” and “max” marks on the dipstick.
If the fluid level is low, add fluid through the dipstick tube. Use a funnel to avoid spilling fluid.
Add fluid slowly, checking the level frequently. Do not overfill the transmission, as this can cause problems.
Once the fluid level is correct, replace the dipstick and tighten it securely.

Tips

Consult your car’s owner’s manual for specific instructions on how to add transmission fluid.
Use the correct type of transmission fluid for your car.
Add fluid slowly and check the level frequently.
Do not overfill the transmission.

Conclusion

Adding transmission fluid is a relatively simple task, but it is important to do it correctly. By following these instructions, you can avoid any potential problems.