Changing the oil in the Nissan Murano Z51 CVT: A complete DIY guide

Crossover owners Nissan Murano second generation, also known as the Z51 model series, are often faced with the need to service the transmission. Jatco CVTs installed on these vehicles require special attention to the condition of the working fluid, since their service life directly depends on the quality of the oil and the regularity of its replacement. Many car owners consider this procedure too complicated or expensive to service, but if you have a minimum set of tools and a clear understanding of the process, you can solve the problem yourself.

Timely replacement of lubricant avoids overheating, wear of cones and belt, and also extends the life of the valve body and solenoids. Unlike classic automatic machines, CVTs are extremely sensitive to overheating and contamination with wear products. Ignoring maintenance regulations can lead to expensive major repairs or complete replacement of the unit, which is not economically feasible.

To successfully complete the job, you will need not only physical strength, but also patience, as well as accuracy in observing temperature conditions. Errors when checking the level or choosing the wrong fluid can lead to immediate failure of the unit. In this article we will analyze in detail each stage, from preparing the necessary materials to the final check of the oil level with the engine running.

Selection of working fluid and preparation of tools

The first and most critical step is the correct selection of transmission fluid. For CVTs Nissan Murano Z51 the manufacturer strictly regulates the use of the original liquid NS-2 or its high-quality analogues that meet the JATCO JF011E specification. The use of universal oils or fluids for other types of gearboxes (CVT NS-3 or ATF Dexron) is strictly prohibited, as this will disrupt the friction properties and lead to belt slippage.

The volume of the system with a partial replacement is about 4-5 liters, while a complete replacement through the device may require up to 10-12 liters of liquid. It is recommended to buy several 4-liter canisters in order to have a supply. It is also necessary to prepare a new fine filter, which is located inside the pan, and a new pan gasket, since the old one often begins to leak when reinstalled.

The toolkit must be complete to avoid delays in the work process. You will need a 10 mm wrench for the drain plug, sockets to remove the protection and pan, and a funnel with a long hose for refilling. Don't forget about a container for used oil and rags for cleaning up spills.

Pay special attention to the condition of the drain plug. If there is a magnet on it, clean it of metal shavings, but do not remove the magnet itself. This is an important element for collecting wear products. If the thread on the plug is damaged, it must be replaced, otherwise oil may leak out when checking the level.

• 🛠️ Set of wrenches and sockets (including extensions)
• 🛢️ Original Nissan CVT Fluid NS-2
• 🔧 New variator filter and pan gasket
• 📏 Torque wrench for precise bolt tightening

⚠️ Attention: Never mix old and new fluid during a partial replacement without flushing the system. This can cause sediment to form and clog the oil passages.

Removing the pan and replacing the filter

After the car has warmed up and the oil has been drained, you can begin to dismantle the pan. The pan mounting bolts are of different lengths, so it is extremely important to remember or write down where they are installed. Confusion during reassembly can lead to disruption of the pan geometry and subsequent leakage. The bolts should be unscrewed crosswise to avoid distortion.

The pallet sticks tightly to the gasket. Carefully pry it up with a flathead screwdriver, being careful not to damage the aluminum housing. Inside you will see a coarse filter (mesh) and a fine filter, if provided by the design of your modification. On Nissan Murano Z51 Usually there is a mesh filter and a fine filter in the housing.

After removing the pan, wash it thoroughly in solvent, removing all remaining old oil and metal shavings. The magnets on the tray must be cleaned until shiny. If “silver dust” (fine aluminum shavings) is found on the walls of the pan, this is a sign of wear on the bearings or gears, which requires diagnostics. Black shavings are normal wear on the belt and cones.

Replacing the filter is a mandatory procedure. The old filter is no longer capable of retaining fine suspended matter that circulates in the system. Install the new filter, making sure the O-rings are straight and not twisted. Tighten the filter mounting bolts with moderate force so as not to strip the threads in the aluminum housing.

• 🧼 Thoroughly clean the tray of sludge and metal dust
• 🔍 Inspect the magnets on the pallet for accumulation of chips
• 🔄 Replace the fine filter with a new original one
• 💧 Wipe the gasket surface from any remnants of old sealant

What to do if the filter is stuck?

If the filter does not unscrew, do not use excessive force. Use a special puller or carefully heat the joint, being careful not to damage the gearbox housing.>

The pallet is assembled using a new gasket. In most cases, sealant is not required if the gasket is of high quality and the surface of the pallet is smooth. If the gasket is damaged or the surface has defects, apply a thin layer of high-temperature sealant, avoiding getting inside the unit.

⚠️ Caution: Excess sealant inside the pan may come off and enter the oil pump, causing instantaneous failure of the variator.

Procedure for refilling with fresh fluid

After installing the pan and filter, you can start refueling. Oil is filled through the hole where the dipstick is usually located or through the service hole on the transmission (depending on the configuration, the Z51 often has a fill hole on the side or through the dipstick). Use a clean funnel with a long hose to prevent dirt from getting inside.

First, fill in about 3-4 liters of liquid. This amount is usually enough to start the pump and drive oil through the system. Start the engine and let it idle for 2-3 minutes. At this moment, switch the gear selector through all positions (P-R-N-D), holding each position for 5-10 seconds. This will help fill the valve body and solenoids with oil.

Then turn off the engine and add a little more fluid. It is important not to overfill, as the oil foams when the variator operates. If you overfill, it will begin to squeeze the seals through the box ventilation. The final level check is carried out only at a certain oil temperature, which we will discuss in the next section.

If you have access to a diagnostic scanner, you can read the current fluid temperature through the OBDII port. This is the most accurate way to determine whether the unit is ready for a level check. Without a scanner, you will have to rely on the engine temperature arrow, which is less accurate, but acceptable for an initial assessment.

• 💧 Fill the starting dose of oil through the filling hole
• 🚗 Move the selector through all gears with the engine running
• 🌡️ Let the engine run to circulate the fluid
• 📉Add oil to approximate level before final check

Level control and temperature control

This is the most critical stage where a mistake can be costly. Oil level in the variator Nissan Murano Z51 Tested strictly at fluid temperatures between 35°C and 45°C. If the oil is cold, it will shrink and the level will be low, which will lead to overfilling after warming up. If it’s hot, the level will be too high and the oil will start to foam.

For accurate control, it is necessary to use a diagnostic scanner, which shows the actual oil temperature in the variator (CVT Oil Temp). Without a scanner, you can focus on the engine temperature, but the error will be significant. Ideal scenario: warm up the engine to operating temperature, then let it idle for 5-10 minutes so that the oil in the box cools down to the desired range.

Unscrew the control plug (usually located on the side wall of the pan or crankcase). If the oil begins to drip or flow in a thin stream, the level is above normal. If a drop appears immediately after unscrewing and quickly stops flowing, the level is normal. If nothing flows, you need to top it up. It is critical that the engine is running at idle speed when checking..

After reaching the desired temperature and checking the level, tighten the control plug. The tightening torque must be precisely adjusted, usually about 4-5 Nm. Excessive force may strip the threads; insufficient force will lead to loss of oil. Use a torque wrench to avoid mistakes.

⚠️ Warning: Checking the level with the engine not running will cause you to add too much oil, which will cause aeration and overheating of the transmission.

If the level is too low, add fluid and repeat the procedure. If it is too high, drain the excess through the control hole until a steady stream appears, which then turns into drops. Take your time, as the oil should drain completely.

Oil temperature (°C)	Flow condition from control hole	Action
Below 30°C	Oil does not flow or drips very slowly	You can’t top up, you need to warm up/cool
35-45°C	The oil flows in a steady stream, then becomes droplets	Level is normal
35-45°C	Oil flows in a strong stream	Drain off excess
35-45°C	Oil doesn't flow at all	Top up until a stream appears
Above 50°C	Oil flows quickly and abundantly	Cool, the level will be too high

Final assembly and test drive

Once the level is set and the inspection plug is tightened, you can assemble the crankcase protection and remove the tools. Before driving, run the engine for another minute to make sure there are no leaks under the car. Inspect the installation location of the pan and inspection plug for oil drops.

The first trip should be calm. Avoid sudden acceleration and high revs during the first 10-15 kilometers. This is necessary so that fresh fluid is evenly distributed throughout all channels of the valve body and saturates the clutches. Listen to the operation of the variator: extraneous noises, kicks or vibrations may indicate problems.

After 500-1000 kilometers, it is recommended to re-check the oil level. During operation, some of the liquid may be displaced or remain in the filter, so the level may change slightly. If the level drops, top up to normal. If the level has increased, there may be a problem with the cooling system or sealing.

Pay attention to the car's behavior when switching modes. Smooth running should be restored, and vibrations at idle (if any) should disappear. If the problem persists, the CVT may need to be adapted via diagnostic equipment.

• 🚗 Carry out a calm test drive without sudden starts
• 👀 Check the tightness of the pan after the trip
• 🔧 Repeat level control after 500 km
• 🎧 Listen to the transmission for any extraneous noise

Common mistakes and ways to prevent them

One of the most common mistakes is ignoring the temperature when checking the level. Many technicians check the level “cold” or “hot”, which leads to incorrect results. Remember that Jatco CVTs are very sensitive to fluid volume, and an error of even 0.5 liters can be fatal.

Another mistake is using non-original fluid. Cheap analogues often do not have the necessary friction characteristics, which leads to rapid belt wear. Even if the canister says "for CVT", make sure it meets the NS-2 specification. Using an NS-3 in a box that requires an NS-2 will result in slippage and failure.

Incorrectly tightening the pan bolts can also cause problems. Tightening too hard will deform the pan and the gasket will no longer hold. Too weak will result in loss of oil. Use a torque wrench and follow the manufacturer's torque recommendations.

Sometimes owners forget about the need to replace the filter. The mesh filter becomes clogged over time and the throughput drops. This causes a drop in pressure in the system and overheating. Always change the filter at every oil change, even if it appears clean.

It is also worth noting the error when draining the oil. If you do not remove the tray, you will not be able to clean the magnets and will not see the actual condition of the wear debris. This deprives you of the opportunity to diagnose problems with the unit in a timely manner.

• ❌ Checking the level if the oil temperature is incorrect
• ❌ Using the wrong fluid (NS-3 instead of NS-2)
• ❌ Ignoring the replacement of the filter and pan gasket
• ❌ Lack of torque control of bolt tightening

When to turn to professionals

Despite the fact that changing the oil is a procedure accessible to many, there are situations when it is better to trust the professionals. If, when draining the oil, you see a large amount of metal shavings, "silver dust" or pieces of rubber, this indicates serious problems inside the variator.

If, after changing the oil, kicks, jerking or vibrations appear that do not disappear after warming up, adaptation of the solenoids or repair of the valve body may be required. Self-adaptation without diagnostic equipment is impossible.

It is also worth contacting a service center if you do not have access to a diagnostic scanner to monitor the oil temperature. A visual assessment of the engine temperature does not provide sufficient accuracy to correctly check the level. In this case, the risk of overfilling or underfilling is too great.

If you are not confident in your abilities or do not have the necessary tools (lift, keys, scanner), do not take risks. The cost of repairing a variator significantly exceeds the cost of professional service. It's better to spend money on work than on a new unit.

Sometimes the problem may not be with the oil, but with the solenoids or speed sensors. In this case, changing the oil will not help, but will only worsen the situation if the cause is not eliminated. Computer diagnostics will help identify errors and understand the real state of the system.

Symptoms of a CVT malfunction

Humming, vibration, kicks when switching, loss of acceleration, overheating, Check Engine light coming on.

Conclusion and final recommendations

Changing the oil in the variator Nissan Murano Z51 Doing it yourself is a doable task that allows you to save money and control the quality of car service. The main thing is to follow the technology, use the right materials and take your time at the stages of checking the level.

Regular maintenance extends the life of the transmission by tens of thousands of kilometers. Do not wait for symptoms of a malfunction to appear; change the oil as scheduled or more often if you operate the car in difficult conditions (city traffic, towing, aggressive driving).

Remember that a CVT is a complex and precise mechanism that requires respect. Properly selected fluid, a clean filter and an accurate level are the three pillars of long-term operation of your transmission. Keep an eye on the condition of your car, and it will respond to you with reliability and comfort.

The introduction of modern technologies in car maintenance makes the oil change procedure more predictable and safe. Use diagnostic scanners, torque wrenches and quality materials to ensure results. Your DIY work is an investment in the longevity of your crossover.

How often do you need to change the oil in the Nissan Murano Z51 CVT?

The manufacturer recommends changing the oil every 60,000 km. However, in conditions of dense city traffic and frequent traffic jams, experts advise reducing the interval to 45,000 - 50,000 km to extend the life of the unit.

Can I use NS-3 fluid instead of NS-2?

No, absolutely not. NS-2 and NS-3 fluids have different friction characteristics and viscosity. Using an NS-3 in a box designed for an NS-2 will result in belt slippage and rapid failure of the variator.

What to do if there is no diagnostic scanner to check the temperature?

It is impossible to accurately check the level without a scanner. You can try to focus on the engine temperature (warm it up to operating temperature, then let it cool for 5-10 minutes), but this is risky. It’s better to find a service or friends with a scanner to avoid overfilling or underfilling.

Do I need to change the filter during a partial oil change?

Yes, the filter must be changed. It retains wear products and becomes clogged over time. If you do not replace the filter, even fresh oil will quickly become contaminated, and the effect of the replacement will be minimal. In addition, the old pan gasket may leak.

How much oil does a Murano Z51 need for a complete change?

With a partial replacement (without removing the pan and without pumping through the apparatus), about 4-5 liters are required. For a complete replacement with flushing of the system with the device, it may require from 10 to 12 liters of fluid, since the old one is replaced by the new one.