How to check the transmission fluid level on your Mercedes Benz? You have come to the right place. In case you were wondering a transmission that is low on fluid could show the same symptoms as a defective transmission. When the transmission is low on fluid it will start to slip or get stuck in gear. When the transmission gets stuck in gear is called the limp mode. If you have been having problems with your transmission, the first thing you need to do is check the fluid level. Don’t spend money on anything, even transmission diagnosis before you check the transmission oil level.
To check the transmission fluid level in a Mercedes Benz you will need a special transmission dipstick. Mercedes Benz cars don’t come with a transmission dipstick. Don’t worry, you can get Transmission Fluid Dipstick 140589152100 for your Mercedes Benz on Amazon for under $20 and free shipping.
Instructions on how to check transmission fluid on a Mercedes Benz. Step by step with pictures and video.
- Warm up the car. To measure the transmission fluid correctly the transmission fluid temperature needs to be at least 80 degrees Celsius. To get the transmission to that temperature you will need to drive the car for 15 minutes before you check the fluid. The best way to make sure your fluid has reached the required temperature is to use a Etekcity Lasergrip 774 Non-contact Digital Laser IR Infrared Thermometer Temperature Gun, Yellow/Black and point at the transmission oil pan. If you don’t want to drive the car you can let it sit running for about 25 min for the transmission oil to reach the 80 degree Celsius.
We are assuming there is at least some oil in the transmission. Verify there is oil in the transmission before you start up the car or start up the warm up procedure.
- Open the hood.
- Pull the air ducts that connect to the engine cover. Grab the engine cover on both sides and pull it straight up. It is help in place with 4 clips.
- Remove engine cover. All you need to do is grab the cover on both sides and lift it up. It’s held in place with 4 clips only. No screws or bolts.
- Locate the transmission fill tube. It is located between the firewall and the engine. It is kind of hidden so look carefully. Be careful not to mistake the engine oil tube with the transmission tube.
- Remove the transmission fill tube cap. First, you will need to brake off the transmission red lock pin. This is what it looks like. You will have to brake off the red lock pin before you can pull out the black cap you see below. If you don’t have the red lock pin that means that someone has checked the fluid before and didn’t install the red lock pin.
- Place the car in R or D. You can place the shifter in reverse or drive position. Make sure to press the parking/emergency brakes. We would prefer to put the car in reverse. It would be wise to have someone stay in the car and hold the brakes while you check the fluid level or make sure to place some block behind the wheel. You don’t want to rely on the parking brakes only.
- Measure the transmission fluid level. See video below.
The transmission dip stick should show level between the low and high 80 degree mark.
- Add Mercedes Benz approved transmission fluid. If you find out that you are low in fluid then make sure to add some. You add fluid through the same tube that you used to check the transmission fluid level. You want to add the Mercedes Benz Approved Automatic Transmission Fluid 236.14 for use with the 5-Speed 722.6 & 7-Speed 722.9 Transmission. Mercedes part# 001 989 68 03 13
- Check the level again. You want to double check the fluid level. If you have to added fluid then you must check the level again. You don’t want to overfill the trasnmission fluid level as that could cause shifting issues. If you accidently added more transmission oil than you should have you can use a 12V Fluid Oil Extractor Scavenge Suction Transfer Pump w/ Hose
- Install the transmission tube cap and red lock pin. If your level is fine than install the cap and the red lock pin. Since you had to brake the red lock pin off you will need to replace it with a new one. They are only a few dollars on Amazon.
- Install the engine cover back on.
- That’s is it. DONE!