How to Check Transmission Fluid?

Transmission oil is a lubricating, oily substance that keeps the transmission lubricated by your car. The type of gear oil you need depends on the brand of your car and whether you have an automatic or manual transmission.

Fill your transmission oil by measuring the oil level, reading the manual and filling the oil with a funnel into the gearbox.

Here we will talk about how to check transmission fluid?

There are several hydraulic systems in your vehicle and the automatic transmission system is one of them.

To maintain this system, you should periodically test the transmission oil to be sure that enough oil is available in sufficient quality in your transmission in order to function properly.​

Steps by Step to Check Transmission Fluid

Please follow the following steps in order to check the transmission fluid.

  • Step 1: Keep your vehicle ready for checking

​Keep your car on level ground and keep your engine running. It can briefly switch through any gear of the automatic transmission before you park.

Lift the bonnet. There is normally a lever inside the car that makes the bonnet jump. Often this left hand is the driver's side. Refer to the user guide if you could not find it.

  • Step 2: Search the transmission pipe

​Search the pipe of the transmission oil. For many latest models of the vehicles, the transmission oil tube will be labeled, if not, refer to the user manual in order to find exact location.

  • Step 3: Take a dipstick

​Once you managed to find the transmission pipe, take a dipstick.

In the case of a rear-wheel drive car, a dipstick is normally located on the back side of the engine and above the oil tank.

In the case of a car with a front wheel drive, the measuring stick is usually located at the front side of the engine and it is attached to the gearbox.

  • Step 4: Check the level of the transmission oil

​Take out the oil rod of the automatic transmission oil. Clean the oil stick with a clean cloth or paper, reinsert it, pull the stick out again and check the level of the automatic transmission oil.

The level of the gear oil must be between two points "full" and "empty" or "hot" and "cold".

Normally you do not require adding gear oil. If the point is well below the "empty" or "cold" line, you possibly have a leak in the system and should bring the car to the garage

  • Step 5: Check the condition of the gear oil

​An excellent automatic transmission oil is usually colored red (although it is sometimes may be light brown or pink), without air bubbles or smell. If one of the following situations is right, take your car to the customer service.

If the gear oil is pale brown and/or smells of burnt toast, the gear oil is burned and it has become useless, it cannot longer absorb the heat that the transmission delivers.

The liquid can be further tested by placing something on a tidy paper towel and wait for 1 minute to see if it spreads. If not, the oil must be replaced immediately, or the gearbox can be seriously damaged.

If the gear oil looks brown, it has been polluted with coolant from a leak in the transmission cooler. Bring the vehicle to the garage immediately.

If the gear oil is either frothy or bubbles, there is excess fluid in the cylinder, the wrong type of gear oil been used, or the engine has a clogged gearbox.​

Related: ​All You Need To Know When It Comes To Oil Matter

  • Step 6: Start adding correct fluid slowly into the transmission

​You should read instruction manual carefully so you will come to know what type of fluid is favorable to your transmission and also check how often you need to replace the transmission fluid.

Using a funnel in hole of the transmission, start pouring fluid into the transmission and ensure to add little at a time otherwise it will be overfilled. How much the quantity you need to add fluid into the transmission is depends on what you are doing?

  • ​If you have found little low level when you have checked with your dipstick, start adding from half a quart to a quart fluid and recheck the level and keep adding until the level is up to the full mark.
  • If you are servicing your transmission and replacing the filter then usually it will be needed 4 to 5 quarts of fluid.
  • Or if you are replacing the whole transmission fluid – it will take from 9 to 13 quarts of fluid.

​Ensure to recheck the level of the transmission fluid with the dipstick and if it has been filled up to the correct mark. Entire process of replacing transmission fluid is finished! Correct transmission fluid is sufficiently present now and your car must be running smoothly like a cat.

​Additional Tips

Check the user manual when to change the automatic transmission oil. If you regularly drive in the mountains or pull heavy trailers, you have to change the gear oil more often.

If you change the gear oil, the automatic transmission oil filter must also be replaced. Always use the kind of gear oil specified by the car manufacturer for your brand and model.​


If you will see a red and oily fluid in the driveway that means the automatic transmission oil leaks. If you suspect a leak but cannot see it, put white wrapping paper under the car so you can see the leak better.


This is the process how to check transmission fluid in your vehicle. Transmission fluid plays a very crucial part in your car.

It is used in the vehicles with self-shifting or automatic transmissions. Usually, transmission fluid comes in red or green color.

It is very necessary to check transmission fluid frequently and if it is on a low level, you should fill it up otherwise your vehicle start hesitating every time when your automatic transmission shifts gears.

Leave A Reply

Your email address will not be published.