Nissan Murano Transmission Fluid Change

Nissan
Nissan Murano Transmission Fluid Change

The Nissan Murano, particularly models spanning the early to mid-2000s, often utilizes a Continuously Variable Transmission (CVT). While CVTs offer improved fuel economy and smoother acceleration compared to traditional automatic transmissions, they are also more sensitive to fluid condition. Regular transmission fluid changes are absolutely crucial to the longevity and performance of the CVT in your Murano. Neglecting this maintenance item can lead to juddering, slipping, premature wear, and ultimately, costly transmission failure. This guide delves into the process of changing the transmission fluid in a Nissan Murano CVT, explaining the rationale behind each step and highlighting potential pitfalls.

Understanding the CVT and Fluid's Role

Before diving into the procedure, it's important to understand the fundamental principles of a CVT. Unlike a conventional automatic transmission that uses gears to provide different ratios, a CVT employs a system of pulleys and a belt or chain. The pulleys, controlled by hydraulic pressure, can change their effective diameter, creating a virtually infinite number of gear ratios. This allows the engine to constantly operate at its most efficient RPM, resulting in better fuel economy and seamless acceleration. The transmission fluid in a CVT plays a multifaceted role:

  • Lubrication: Reducing friction between moving parts, especially the belt/chain and pulleys.
  • Hydraulic Pressure: Transmitting power to control the pulley diameters and engage the transmission.
  • Cooling: Dissipating heat generated by friction and hydraulic action.
  • Cleaning: Carrying away wear particles and contaminants.

As the fluid ages, it degrades, losing its lubricating properties, accumulating contaminants, and reducing its ability to effectively transmit hydraulic pressure. This leads to increased wear, reduced performance, and potential damage to the transmission. Therefore, regular fluid changes are non-negotiable for a healthy CVT.

Preparing for the Fluid Change

Gathering the necessary tools and materials is the first step. You'll need:

  • Nissan CVT Fluid NS-2 or NS-3: Crucially, use the correct fluid specified for your Murano's model year. Using the wrong fluid can severely damage the CVT. Consult your owner's manual or a Nissan dealer to confirm the correct fluid type. NS-2 is often specified for older models, while NS-3 is used for newer ones.
  • Drain Pan: A large drain pan to catch the old fluid.
  • Socket Set: Including sockets for the drain plug and fill plug.
  • Torque Wrench: Essential for properly tightening the drain plug. Over-tightening can damage the threads.
  • Funnel: For adding the new fluid. A long-necked funnel is preferred.
  • Measuring Container: To accurately measure the amount of fluid drained, allowing you to add the same amount of new fluid.
  • Rags or Shop Towels: For cleaning up spills.
  • Gloves: To protect your hands from the fluid.
  • Jack and Jack Stands (Optional but Recommended): Lifting the vehicle provides easier access to the drain plug. Never work under a vehicle supported only by a jack.
  • Level (Optional): To ensure the vehicle is level for accurate fluid level checking.
  • Consult Your Service Manual: For specific torque specifications and fluid capacities for your Murano's year and model.

The Fluid Change Procedure

  1. Warm Up the Transmission: Drive the Murano for a short distance (about 10-15 minutes) to warm up the transmission fluid. Do not overheat the transmission. Warm fluid flows more easily.
  2. Safely Raise the Vehicle (Optional): If using a jack, securely lift the vehicle and support it with jack stands. Ensure the vehicle is stable before proceeding.
  3. Locate the Drain Plug: The transmission drain plug is typically located on the bottom of the transmission pan. Consult your service manual for the exact location.
  4. Position the Drain Pan: Place the drain pan under the drain plug.
  5. Remove the Drain Plug: Using the appropriate socket, carefully loosen and remove the drain plug. Be prepared for the fluid to flow out quickly.
  6. Allow the Fluid to Drain Completely: Let the fluid drain until it stops dripping. This may take 20-30 minutes.
  7. Inspect the Drain Plug: Check the drain plug for any damage or debris. Clean the magnet on the drain plug (if equipped) to remove any accumulated metal particles.
  8. Reinstall the Drain Plug: Install a new crush washer (recommended) onto the drain plug and reinstall the plug. Tighten it to the torque specification listed in your service manual. Over-tightening can damage the transmission pan.
  9. Locate the Fill Plug/Dipstick Tube: The location of the fill plug or dipstick tube varies depending on the Murano's year and model. It's typically located on the side or top of the transmission. Consult your service manual for the exact location. If there's no dipstick, fluid level check will usually be performed from a specific plug/tube.
  10. Add New Fluid: Using a funnel, carefully add the same amount of new CVT fluid that you drained out. Use the measuring container to ensure accuracy. Do not overfill.
  11. Check the Fluid Level: The method for checking the fluid level varies depending on whether your Murano has a dipstick or not.
    • With Dipstick: Start the engine and let it idle for a few minutes. With the engine running and the transmission in park, check the fluid level on the dipstick. Add or remove fluid as needed to reach the correct level, usually between the MIN and MAX marks.
    • Without Dipstick: Many newer Muranos lack a traditional dipstick. In this case, the fluid level is checked using a specific procedure that involves running the engine, shifting through the gears, and then removing a check plug on the transmission pan. Fluid should slowly drip out when the level is correct. This procedure is critical and specific to your model. Refer to your service manual for precise instructions. Often, special tools might be required for accurate fluid-level calibration.
  12. Test Drive: Take the Murano for a short test drive to allow the transmission to warm up and cycle the fluid. Check for any leaks around the drain plug.
  13. Recheck Fluid Level: After the test drive, recheck the fluid level and adjust as necessary.
  14. Properly Dispose of Used Fluid: Dispose of the used transmission fluid responsibly at a recycling center or auto parts store.

Important Considerations and Potential Pitfalls

  • Fluid Compatibility: Always use the correct CVT fluid specified for your Murano. Mixing different types of fluids or using the wrong fluid can cause serious damage.
  • Torque Specifications: Adhering to the torque specifications for the drain plug is essential. Over-tightening can strip the threads in the transmission pan.
  • Fluid Level Accuracy: Accurate fluid level is crucial for proper transmission operation. Overfilling or underfilling can lead to problems. Pay very close attention to the procedure for your specific model, especially if it lacks a dipstick.
  • Cleanliness: Maintain a clean working environment to prevent contaminants from entering the transmission.
  • Don't Flush Without Proper Knowledge: Some people advocate for a complete transmission flush. While this can be beneficial, it's crucial to understand the process and potential risks. Incorrectly performed flushes can dislodge debris and cause blockages. If you're not comfortable performing a flush yourself, it's best to have it done by a qualified technician. A drain and fill, as described above, is generally a safer and more common maintenance procedure.
  • Observe for Unusual Noises or Behavior: After changing the fluid, pay close attention to the transmission's performance. Note any unusual noises, slipping, or jerking. If you experience any problems, consult a qualified technician immediately.
  • Consult a Professional: If you are unsure about any aspect of this procedure, it's always best to consult a qualified mechanic. A transmission repair is far more expensive than a professional fluid change.

Performing a regular transmission fluid change on your Nissan Murano's CVT is a vital maintenance task that can significantly extend its lifespan and ensure optimal performance. By following these steps and heeding the warnings, you can keep your Murano shifting smoothly for years to come. Remember, preventative maintenance is always cheaper than reactive repair.

Concluding Remarks

This guide is meant as an overview and it's crucial to consult your vehicle's service manual for exact specifications and procedures specific to your year and model. Regularly changing your Murano's CVT fluid will keep it running smoothly, efficiently, and reliably for years to come. Take your time, be precise, and don't hesitate to seek professional help if needed.

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