2007 Nissan Murano Transmission Fluid

The 2007 Nissan Murano, a popular crossover SUV, utilizes a Continuously Variable Transmission (CVT), a departure from traditional automatic transmissions. Understanding the specific fluid requirements of this CVT is crucial for maintaining its longevity and performance. This guide delves into the intricacies of the 2007 Murano's transmission fluid, covering its properties, function, maintenance, and potential issues.

Understanding the CVT and its Fluid Demands

Unlike conventional automatic transmissions that use gears to provide different ratios, a CVT relies on a system of belts and pulleys to create a seamless and virtually infinite range of gear ratios. This design offers several advantages, including improved fuel efficiency and smoother acceleration. However, it also places unique demands on the transmission fluid.

The fluid in a CVT performs several vital functions:

Lubrication: The fluid lubricates the pulleys, belt, bearings, and other internal components, minimizing friction and wear.
Hydraulic Pressure: The fluid transmits hydraulic pressure to actuate the pulley system, controlling the gear ratio.
Cooling: The fluid dissipates heat generated by friction and hydraulic operation, preventing overheating.
Friction Modification: This is a critical function specific to CVTs. The fluid needs to maintain a specific coefficient of friction to ensure the belt grips the pulleys properly without slippage. This requires precisely formulated additives.
Cleaning: The fluid carries away debris and contaminants, keeping the transmission clean.
Corrosion Protection: The fluid protects the internal components from corrosion.

Because of these demanding functions, the 2007 Nissan Murano CVT requires a specialized fluid that meets specific performance standards. Using the wrong fluid can lead to serious damage and premature failure of the transmission.

The Importance of NS-2 CVT Fluid

Nissan explicitly specifies the use of their NS-2 CVT fluid for the 2007 Murano. This fluid is a proprietary formulation designed to meet the unique requirements of Nissan's CVT transmissions. Do not substitute with generic automatic transmission fluid (ATF) or other fluids claiming to be "universal" CVT fluids unless they are explicitly certified and tested to meet the NS-2 specification.

Why is NS-2 so important? The NS-2 fluid contains specific friction modifiers that are essential for the proper operation of the Murano's CVT. These modifiers create the necessary friction between the belt and pulleys to prevent slippage while allowing smooth shifting. Using a fluid without the correct friction modifiers can result in belt slippage, shuddering, reduced fuel economy, and accelerated wear on the transmission components.

Furthermore, the viscosity characteristics of NS-2 are tailored to the operating temperatures and pressures within the Nissan CVT. Using a fluid with a different viscosity can affect the hydraulic pressure and lubrication, leading to performance issues and potential damage. Nissan has now superseded NS-2 with NS-3. While NS-3 is compatible with newer models, consult your owner's manual to verify compatibility with your 2007 Murano. If NS-3 is listed as compatible, you can use it. Otherwise, continue using NS-2 or a fluid that is explicitly formulated and tested to meet NS-2 specifications.

Checking the Transmission Fluid Level

Regularly checking the transmission fluid level is crucial for maintaining the health of the CVT. Low fluid levels can lead to insufficient lubrication, overheating, and damage to the transmission. The 2007 Murano does *not* have a dipstick for checking transmission fluid levels. Instead, it has an overflow tube. Checking the fluid level requires a specific procedure and should ideally be performed by a qualified mechanic or someone with experience working on CVTs.

Here's a general overview of the procedure (but consult your repair manual for specific instructions and torque specifications):

Warm-up: The transmission needs to be at a specific temperature range, typically between 95°F (35°C) and 113°F (45°C). Using a scan tool is the most accurate way to determine the transmission fluid temperature.
Level Surface: Park the vehicle on a level surface.
Access the Check Plug: Locate the check plug on the side of the transmission pan. This is typically a small bolt or plug.
Remove the Check Plug: Carefully remove the check plug.
Observe the Flow: If fluid drips out, the level is correct. If no fluid drips out, the level is low.
Add Fluid (If Necessary): If the fluid level is low, add NS-2 (or compatible) fluid through the fill plug until fluid drips out of the check plug.
Reinstall Check Plug: Reinstall the check plug to the proper torque specification.

Important Notes:

The temperature of the transmission fluid is critical for accurate measurement. If the fluid is too hot or too cold, the reading will be inaccurate.
Be extremely careful when working around the hot exhaust system and other hot components.
Always use a new crush washer or sealing washer when reinstalling the check plug and fill plug.
If you are not comfortable performing this procedure yourself, it is best to take your vehicle to a qualified mechanic.

Changing the Transmission Fluid

Regular transmission fluid changes are essential for extending the life of the CVT. Over time, the fluid degrades, losing its lubricating properties and accumulating contaminants. Nissan recommends a specific service interval for changing the CVT fluid. Consult your owner's manual or a qualified mechanic for the recommended interval, which can vary depending on driving conditions.

The procedure for changing the transmission fluid is more involved than a simple drain and fill. It typically involves:

Draining the Old Fluid: Remove the drain plug from the transmission pan to drain the old fluid.
Replacing the Filter (if applicable): Some 2007 Muranos may have an accessible transmission filter. If so, replace it during the fluid change. Some filters are only accessible by removing the transmission.
Cleaning the Pan (Optional): Some mechanics recommend removing and cleaning the transmission pan to remove any accumulated debris.
Replacing the Pan Gasket: Always replace the transmission pan gasket when reinstalling the pan.
Filling with New Fluid: Add the correct amount of NS-2 (or compatible) fluid through the fill plug.
Level Check: Perform the fluid level check procedure described above to ensure the fluid level is correct.

A complete fluid exchange, using a specialized machine, is sometimes recommended for CVTs. This ensures that virtually all of the old fluid is removed from the transmission, including the torque converter and valve body. However, some mechanics advise against forced fluid exchanges on older transmissions, as they can dislodge debris and cause problems. Discuss the best approach with a qualified mechanic.

Signs of Transmission Problems

Be aware of the following signs that may indicate a problem with your 2007 Murano's transmission:

Shuddering or Jerking: This can be a sign of belt slippage or contaminated fluid.
Delayed Engagement: If there is a delay between shifting into drive or reverse and the vehicle moving, there may be a problem with the transmission.
Slipping: If the engine revs up without the vehicle accelerating, the transmission may be slipping.
Unusual Noises: Whining, humming, or clunking noises from the transmission can indicate a problem.
Warning Lights: The "Service Engine Soon" light or a transmission-specific warning light may illuminate if there is a problem with the transmission.

If you experience any of these symptoms, it is important to have your vehicle inspected by a qualified mechanic as soon as possible. Ignoring these problems can lead to more serious damage and costly repairs.

Conclusion

Maintaining the 2007 Nissan Murano's CVT requires understanding its specific fluid requirements and adhering to the recommended maintenance schedule. Using the correct fluid, checking the fluid level regularly, and changing the fluid at the recommended intervals are crucial for ensuring the longevity and performance of the transmission. If you are not comfortable performing these tasks yourself, it is always best to seek the assistance of a qualified mechanic experienced with CVTs. Proper maintenance is key to avoiding costly transmission repairs and enjoying the smooth, efficient performance that the CVT offers.