Do You Check Transmission Fluid With Car Running or Off?

Checking your transmission fluid is an important part of maintaining your car and ensuring that it runs properly. But there is some debate about whether you should check the fluid with the car running or off. Here is a detailed look at the pros and cons of each method to help you make the best decision for your vehicle.

Checking Transmission Fluid With Car Running

Pros:

• More accurate reading: When the car is running, the transmission fluid is circulating, which allows you to get a more accurate reading of the fluid level. This is because the fluid will be at its operating temperature and will expand to its normal level.
• Easier to check: With the car running, the fluid will be more fluid and easier to pour out of the dipstick tube. This can make it easier to get a good reading.

Cons:

• Can be dangerous: Checking the transmission fluid with the car running can be dangerous if you are not careful. The fluid can be hot and can cause burns if it comes into contact with your skin.
• Can damage the transmission: If you do not check the fluid level correctly, you can damage the transmission. This is because if the fluid level is too low, the transmission can overheat and fail. Conversely, if the fluid level is too high, it can cause the transmission to slip and not engage properly.

Checking Transmission Fluid With Car Off

Pros:

• Safer: Checking the transmission fluid with the car off is safer than checking it with the car running. There is no risk of burns or damage to the transmission.
• Less likely to get a false reading: With the car off, the fluid will not be circulating and will have settled to its normal level. This can make it less likely to get a false reading.

Cons:

• Less accurate reading: When the car is off, the transmission fluid will be cooler and will not have expanded to its normal level. This can lead to a less accurate reading of the fluid level.
• More difficult to check: With the car off, the fluid will be less fluid and may not pour out of the dipstick tube as easily. This can make it more difficult to get a good reading.

Ultimately, the decision of whether to check your transmission fluid with the car running or off is up to you. There are pros and cons to both methods, so you should weigh the risks and benefits before making a decision. If you are not comfortable checking the fluid level yourself, you can always take your car to a mechanic and have them do it for you.

Whichever method you choose, be sure to check the transmission fluid level regularly. This will help you to keep your car running properly and avoid costly repairs.