CVT gearbox Nissan Jatco, mounted on a crossover Nissan Murano Z51, is a high-tech unit that requires special attention to the condition of the working fluid. It is the level and quality of the oil that determines the smoothness of gear shifting, the absence of jerks and the overall transmission resource, which can amount to hundreds of thousands of kilometers with proper maintenance.
Many owners Nissan Murano It is a mistaken belief that the transmission is maintenance-free, but this is a myth that can lead to costly repairs. Regularly checking fluid levels is a simple but critical process that allows you to identify oil leaks or burnouts early, avoiding critical breakdowns.
Preparing the car and necessary tools
Before starting the procedure, you must make sure that the car is on a perfectly flat horizontal surface. Any slope, even a slight one, will distort the oil level readings, which will lead to erroneous conclusions and subsequent problems with the operation of the box.
You will need access to a diagnostic scanner capable of reading transmission fluid temperature in real time, as well as a set of wrenches and a measuring cup. Without accurate knowledge of the oil temperature, the check is considered pointless, since the volume of the liquid directly depends on its heating.
- 🔧 Diagnostic scanner (OBDII adapter with program for Nissan)
- 🔑 A set of keys and a ratchet for removing the crankcase protection
- 🌡️ Graduated cylinder or syringe for taking a liquid sample
- 🛢️ Original CVT NS-3 fluid (for topping up if necessary)
Pay special attention to the condition of the protective tray. If there are traces of impacts or dents, they must be eliminated before starting work, so as not to damage the sensors or the structure itself during dismantling.
Warming up the transmission to operating temperature
The key factor when checking is the oil temperature. Unlike conventional automatic transmissions, a CVT Nissan Murano Z51 requires strict adherence to the temperature range, usually ranging from 40°C to 80°C, and for accurate testing - strictly 45-50°C.
Warming up is carried out by driving the car in normal mode or working in place by switching selector modes. Simply standing still with the engine running is not enough, as the oil in the torque converter can become hot while the rest of the system remains cold.
⚠️ Attention: If you warm up the variator in place, be sure to switch the selector from position P to D and back, holding each mode for 5-10 seconds. This will ensure uniform heating of the liquid throughout the system.
Use a scanner to monitor the temperature. Once the value stabilizes in the desired range, turn off the engine and proceed to the next step. Do not allow overheating above 60°C, as when it cools down the level will drop below normal and you may add too much.
Drain and level check procedure
Remove the engine and transmission housing protection. Find the drain plug located on the variator pan and place a container under it. Unscrew the cap and allow excess liquid to drain.
If the oil flows out in a thin stream and stops quickly, the level is most likely normal. If the flow is strong and does not stop, then there is too much oil. If it drips only occasionally, the liquid needs to be added.
- 🧹 Clean the area around the drain plug of dirt and oil
- 📏 Use a measuring cup to accurately measure the volume of liquid drained
- 🔩 Tighten the plug to the recommended torque (usually 35 Nm)
For an accurate check, the method of measuring through a control hole is often used, where the level should be strictly to the edge of the hole. However, on Nissan Murano Z51 The draining method at a certain temperature is more often used.
- According to the control hole
- By drain at 45 degrees
- By dipstick (if available)
- I never check
Control of the quality and color of the working fluid
Assess the color and smell of the drained liquid. Fresh oil NS-3 It has a bright red tint and a pleasant smell. A foreign burning smell or a dark, almost black color indicates overheating and degradation of the clutches.
The presence of metal shavings on the plug magnet or in the tray is an alarming signal. Even a small amount of fine metal dust indicates the beginning of wear on the internal components of the variator.
Pay attention to the presence of an emulsion (a mixture of oil and water). If the oil has a pinkish or milky white tint, this means that antifreeze has entered the system, which often happens when the heat exchanger breaks down.
⚠️ Attention: If you notice metal shavings or a burning smell, simply adding oil will not solve the problem. It is necessary to carry out a complete diagnosis of the variator in a specialized service.
☑️ Oil inspection
Diagnostics by error codes and parameters
Even if the level appears normal visually, the electronics can detect pressure deviations. Connect a scan tool and check for errors related to pressure in the variator (usually codes P0841, P0842, P0843).
These errors often indicate that the pump is unable to produce the required pressure due to low oil levels or wear on the pump itself. Ignoring these signals will lead to belt slippage and rapid failure of the unit.
Also check the CVT adaptation parameters. If the values deviate from the factory settings, it may be necessary to reset the adaptations after an oil change or repair.
What do pressure error codes mean?|A code P0841 indicates that the pressure sensor is not seeing the expected change in pressure when shifting gears. This could be caused by a low oil level, a clogged filter, or a faulty sensor. Code P0842 indicates low line pressure, and P0843 indicates high line pressure.-->
Possible consequences of incorrect level
Underfilling of oil leads to cavitation of the pump. Air entering the system creates bubbles that collapse under pressure, causing metal erosion and overheating. The CVT starts to kick, especially when shifting from 1st to 2nd gear.
Overfilling oil is also dangerous. Excess fluid foams as the shaft rotates, reducing pressure and causing the belt to slip. In addition, the foam can squeeze out the seals, causing leaks.
Symptoms of incorrect levels are often disguised as engine or electronic problems, making it difficult for an owner without experience to self-diagnose.
Symptom
Probable Cause
Action
Jerks at start
Low oil level
Check and top up to normal
The varicator is kicking
Oil overflow (foam)
Drain excess liquid
Noise when driving
Bearing wear
Diagnostics in the service
Burning smell
Overheating of clutches
Oil change and filter
Frequent maintenance errors
One of the most common mistakes is using non-original fluid. CVTs Nissan extremely sensitive to viscosity and friction, so the use of analogues can lead to rapid wear.
Another mistake is checking the level “cold”. The oil contracts as it cools, and when checking a cold engine you will see a low level, which will lead to overflow when warming up.
Some owners try to check the level through the pressure sensor hole without observing the temperature conditions, which gives completely incorrect results.
⚠️ Attention
The use of non-original CVT NS-3 fluid can lead to irreversible failure of the valve body and variator belt within 10,000 km.
Final recommendations for maintenance
Regularly checking the level and changing the oil in the variator Nissan Murano Z51 - the key to long service life of the transmission. It is recommended to carry out a partial replacement every 40-50 thousand kilometers and a complete replacement every 80-100 thousand.
If you are not confident in your abilities or do not have diagnostic equipment, it is better to entrust this procedure to professionals. An error in oil level could cost you the cost of a new CVT.
Monitor the behavior of the car while driving. Any changes in the nature of gear shifting should be a reason for immediate diagnosis of the level and condition of the transmission fluid.
An accurate check of the oil level in the variator is only possible if the temperature is maintained at 45-50°C and the original NS-3 fluid is used.
Is it possible to check the oil level without a scanner?
Without a scanner showing the oil temperature, an accurate check is impossible. It is impossible to determine the exact temperature of 45-50°C by eye or by heating time, which will lead to an error in determining the level.
How often does the Murano Z51 CVT oil need to be changed?
The manufacturer claims a “maintenance-free” box, but experts recommend changing the oil every 60,000 km to preserve the life of the Jatco variator.
Which fluid is suitable for Murano Z51?
The only right choice is the original Nissan CVT Fluid NS-3. The use of other fluids (NS-2, ATF, etc.) is strictly prohibited.
What to do if the oil is dark, but without a burning smell?
The dark color of the oil without a burning odor indicates aging of the additives. It is necessary to replace the oil and filter, since the properties of the fluid have already deteriorated.
Is it necessary to warm up the engine before checking?
Yes, the engine must be warmed up to operating temperature so that the oil in the torque converter also begins to heat up, but the main parameter is the temperature of the transmission itself, not the engine.