Maintaining the proper fluid level in your automatic transmission is crucial for smooth shifting, longevity, and overall vehicle performance. This guide provides step-by-step instructions for checking and maintaining transmission fluid levels in your Mercedes-Benz R107.
Why Checking Transmission Fluid is Important
🔹 Ensures smooth gear shifts and prevents transmission slippage.
🔹 Prevents overheating by providing proper lubrication.
🔹 Extends transmission life by reducing wear and tear.
🔹 Avoids costly repairs caused by low or contaminated fluid.
When and How to Check Transmission Fluid
📌 Check the fluid level regularly and always before long trips.
Step 1: Prepare the Vehicle
✅ Park the vehicle on level ground.
✅ Engage the parking brake.
✅ Move the selector lever to position “P” (Park).
✅ Start the engine and let it idle for 1-2 minutes to warm up the transmission.
Step 2: Locate and Measure the Fluid Level
1️⃣ Locate the dipstick and ensure it is fully inserted with the locking lever released (1).
2️⃣ Use a clean, lint-free cloth to wipe the dipstick before taking a reading.
3️⃣ Insert the dipstick completely, then remove it again to check the fluid level.
📌 Extreme cleanliness is required—even the smallest impurity can cause transmission issues.
Understanding Fluid Level Readings
📌 The fluid level varies with temperature:
✅ At normal operating temperature (80°C / 176°F):
- The level should be between the maximum and minimum marks on the dipstick.
✅ At shop temperature (20-30°C / 68-86°F):
- The fluid level may be 10mm (0.4 inches) below the minimum mark.
- This is normal after a fluid change when the transmission has cooled.
🚨 Important:
- DO NOT overfill the transmission—excess fluid must be drained or siphoned if it exceeds the max mark at operating temperature.
- Always reinstall the dipstick securely by pushing it all the way in and swinging the locking lever down (2).
Adding or Changing Transmission Fluid
📌 If fluid needs to be added:
✅ Use only the recommended ATF specified for your Mercedes-Benz R107.
✅ Pour the fluid slowly through a fine-mesh filter into the dipstick opening to prevent contamination.
✅ Recheck the level using the dipstick after adding fluid.
🚨 Warning:
- Never mix different types of transmission fluid, as this can affect performance.
- If the fluid appears dark, burnt or has debris, a full transmission fluid change is recommended.
Key Takeaways
✅ Regularly check the fluid level to maintain transmission performance.
✅ Measure only at the correct temperature for accurate readings.
✅ Use a fine-mesh filter when adding fluid to avoid contamination.
✅ Never exceed the maximum fluid level—overfilling can damage internal components.
✅ Ensure the dipstick is fully inserted and locked after checking or filling.
By following these steps, you can prolong the life of your automatic transmission and keep your Mercedes-Benz R107 running smoothly for years to come. 🚗🔧
