Changing the oil in the Nissan Murano Z51 CVT: owner's manual

CVT Jatco JF011E installed on a crossover Nissan Murano second generation (Z51), is a reliable unit, subject to maintenance regulations. However, many owners mistakenly believe that the transmission fluid is filled for the entire life of the car. This misconception leads to accelerated wear of clutches and cones. Regularly changing the oil in the Murano Z51 variator is the only way to extend the life of the unit up to 300 thousand kilometers without major repairs.

The maintenance procedure has its own technical nuances, which differ from changing the oil in classic automatic or manual transmissions. Wrong choice of fluid, violation of the temperature regime when checking the level, or ignoring the condition of the filters can lead to fatal consequences. In this material, we will look at how to choose the right consumables, perform a full or partial replacement, and accurately set the oil level to avoid breakdowns.

Choosing the Right Transmission Fluid for the Z51

The heart of the variator lubrication system is a specific fluid, which not only reduces friction, but also ensures the operation of the torque converter and friction packs. For model Nissan Murano Z51 manufacturer strictly regulates the use of original fluid CVT Fluid NS-2. The use of analogues or fluids of other specifications (for example, NS-3, intended for newer models) is strictly prohibited, as this will change the viscosity characteristics and lead to belt slippage.

There are two main approaches to choosing consumables: using only original products or high-quality certified analogues. Dealers strongly insist on the original, but independent experts allow the use of fluids from the world's leading brands if they have the appropriate approval from the manufacturer Jatco. It is important to understand that saving on a few liters of oil can cost the owner tens of times more when repairing a variator.

• ✅ Original: Nissan CVT Fluid NS-2 (synthetic fluid, optimal for Z51).
• ✅ Analogues: Idemitsu CVT NS-2, Motul Multi CVT, Shell Spirax S4 CVT.
• ❌ Prohibited: Fluids marked NS-3, ATF Dexron or any multipurpose oils.

⚠️ Attention: Never mix NS-2 liquid with NS-3. These are different compositions with different additives, and mixing them will lead to the oil curdling and immediate failure of the variator.

Calculation of volume and preparation for service

Before you begin, you need to clearly understand how much liquid is required. For Nissan Murano Z51, the amount of oil depends on the type of procedure performed. With a partial replacement, when only part of the liquid is drained from the pan, about 4-5 liters will be required. If you are planning a complete replacement with flushing or the hardware method, the volume can reach 10-12 liters, since some of the oil remains in the torque converter and radiator channels.

In addition to the liquid itself, it is critical to prepare the filters. There are two filters in the Z51 variator pan: a coarse metal mesh filter and a fine paper filter. The mesh filter can be washed, but the paper element must be replaced with each procedure. Ignoring filter replacement negates the effect of changing the oil, as dirt will continue to circulate in the system.

Also, do not forget to purchase a pan gasket if it is made of rubber or plastic. Metal trays often have a sealant that must be removed and reapplied, but using a pre-made sealer is safer and cleaner. To operate, you will need a 10 and 19 key, a funnel, a filling hose and a container for draining waste fluid with a volume of at least 5 liters.

• 🔧 Tools: Set of sockets, torque wrench, filling hose.
• 🛢️ Consumables: 5 liters of oil (for partial), pan gasket, coarse filter (if the mesh is damaged).
• 🧼 Additionally: Carburetor cleaner, rags, gloves.

Technology for draining old fluid

The process begins with warming up the transmission. The engine should be running at idle speed, and the automatic transmission selector should be moved through all positions several times, holding each position for 3-5 seconds. This is necessary so that the oil warms up to operating temperature and comes out of all channels, as well as to wash away sediment from the walls of the pan. The optimal temperature of the liquid is 50-60 degrees Celsius.

After warming up, the car is placed on a lift or overpass. Place a container under the drain hole. The drain bolt is located on the pan itself, usually a 19-mm bolt. When unscrewing it, be careful: the oil flow can be strong and hot. Let the liquid drain completely until it turns into sparse drops. This will take about 15-20 minutes.

It is important to inspect the contents of the drained oil. If you see large metal particles or clutch tails in the pan, this is a sign of a serious problem within the variator. A small amount of metal shavings on the drain bolt magnets is normal, but should not exceed the size of a match head. If there are a lot of chips, diagnostics and possibly repair of the unit will be required before changing the oil.

⚠️ Attention: Do not unscrew the filler plug before draining! If you open the filler hole and the drain is stuck or difficult to access, you will not be able to drain the oil and the procedure will take hours.

Replacing filters and cleaning the pan

After the liquid has completely drained, the pan must be removed. The bolts around the perimeter are unscrewed, after which the pallet is carefully detached. Be prepared for about 0.5-0.7 liters of oil remaining in the pan. This is fine. Carefully pour the remainder into a container. Next, the coarse metal mesh is removed, which is bolted to the variator body.

The strainer must be thoroughly washed in solvent or carburetor cleaner. Use a soft brush to remove stubborn dirt and metal shavings. If the mesh cells are damaged or deformed, it must be replaced with a new one. The fine paper filter is usually located inside the housing or in a separate block and is only replaced with a new one. Washing the paper filter is not permitted.

The variator pan should be washed until shiny. Pay special attention to the magnets that are located at the bottom of the tray. They collect fine metal dust. Clean them thoroughly from plaque. If there are large pieces of metal on the magnets, this is a warning sign. After cleaning the pan, apply a new coat of sealant or install a new gasket if the pan is metal.

Refilling procedure and level setting

The variator is filled through the filler hole located on the gearbox housing. Use a hose and funnel for convenience. Pour in 4 liters of liquid. This is the approximate volume required to begin the scan. After refueling, it is necessary to tighten the drain bolt to the recommended torque, which is usually 45 Nm, so as not to strip the aluminum threads.

Now the most important stage begins - setting the level. Start the engine and warm up the variator. Monitor the oil temperature using a diagnostic scanner or relying on the readings of the engine temperature sensor (if there is no scanner), but the ideal option is to monitor the transmission temperature. The oil level is checked with the engine running, the selector must be in position P or N.

Unscrew the control bolt (filler). If the oil flows in a trickle, the level is higher than normal. If it drips or does not flow at all, you need to top it up. The ideal level is when the oil begins to flow out in a thin stream and stops, turning into rare drops. This occurs at an oil temperature of 35 to 45 degrees Celsius. If you overheat the CVT to 50-60 degrees, the level will rise and you risk overfilling the oil, which will lead to foaming and overheating.

• 🌡️ Check temperature: 35-45°C (low level) or 50-55°C (high level).
• ⚙️ Condition: Engine running, selector lever in P or N.
• 💧 Criterion: A thin stream turning into drops.

Diagnostics and typical errors when replacing

One of the most common mistakes made by Murano Z51 owners is checking the level when it is cold. If the oil is cold, the level will be significantly lower than normal, and you will add too much. When heated, the volume of liquid will expand, which will lead to overflow. Excessive pressure inside the CVT can push out seals and cause leaks, and also lead to oil aeration (foaming), which causes overheating and loss of pressure in the system.

Another common mistake is ignoring the torque converter. During a partial replacement, about 40% of the old oil remains in the torque converter. If you change the oil every 60-80 thousand kilometers, this may be enough. However, if the mileage exceeds 100 thousand and the oil has never been changed, it is better to carry out the procedure in two stages: drain and fill with new oil, drive 500-1000 km, and then repeat the procedure. This will flush out the old fluid from the torque converter.

Incorrectly tightening the pan bolts can also be a problem. The aluminum body of the variator is soft, and with excessive force, you can break the threads or deform the pan, which will lead to leaks. Use a torque wrench and tighten the bolts in a crisscross pattern, gradually increasing the torque. The gasket must be installed evenly, without distortion.

What happens if you pour oil into the variator?

When overfilled, the oil begins to foam due to the rotation of the shaft inside the tank. Foam does not provide adequate pressure, which leads to clutch slippage, overheating and rapid wear. It is also possible for the seals to squeeze out and leak.

Final recommendations and service intervals

To ensure the durability of the variator on the Nissan Murano Z51, it is recommended to change the oil every 40-50 thousand kilometers. This is a more frequent interval than many competitors, but it is justified by the design features of the Jatco CVT. Frequent replacement allows wear debris to be removed before it clogs the valve body or damages the cones.

If you operate the car in difficult conditions: frequent traffic jams, towing a trailer, off-road driving or in hot climates, the interval should be reduced to 30-35 thousand kilometers. Under such conditions, the oil quickly loses its properties and oxidizes. Regular diagnostics of the oil level and condition is the key to ensuring that your crossover will last a long time without costly repairs.

After changing the oil, it is possible to change the nature of switching (in this case, the operation of the variator) in the first few hundred kilometers. This is normal: fresh oil lubricates better and changes the pressure in the system. If shocks, kicks or extraneous noises appear, immediately contact a specialist for diagnosis. A correctly performed NS-2 oil change is 90% of success in the long service life of the Nissan Murano Z51 CVT.

Frequently asked questions (FAQ)

Is it possible to change the oil in the Murano Z51 CVT yourself?

Yes, the procedure for changing the oil in the Nissan Murano Z51 CVT does not require complex equipment and can be done independently if you have a pit or a lift. The main thing is to strictly observe temperature conditions when checking the level and use the correct NS-2 fluid.

How often do you need to change the oil in the variator on a Murano Z51?

Official regulations often indicate "whole service life", but the real experience of owners and mechanics shows that the optimal interval is 40,000 - 50,000 kilometers. Under severe operating conditions, the interval is reduced to 30,000 km.

Do I need to change the filter when changing the oil?

Definitely. The Z51 variator has two filters: mesh (coarse) and paper (fine). The mesh one can be washed, but the paper one must be replaced at every oil change. Ignoring this point reduces the effectiveness of the replacement.

What to do if after changing the oil there are shocks?

In the first 100-200 km, slight changes in operation are possible due to adaptation and pressure changes. If the shocks are strong or noises appear, check the oil level (possibly overfilled) or contact a diagnostician to check the pressure in the valve body and the condition of the clutches.