Power steering fluid Murano Z51: selection, replacement and operating features

Power steering (power steering) in a crossover Nissan Murano The second generation (Z51 body) is a critical element of the vehicle's control system. This mechanism provides ease of maneuvering when parking and high precision control at high speeds, while maintaining the necessary feedback from the road. Many owners mistakenly believe that the fluid in the power steering reservoir does not require replacement, but this misconception can lead to costly repairs to the pump or steering rack.

Power steering system on the model Murano Z51 operates under high pressure, which places special demands on the quality of the hydraulic fluid. Over time, the oil loses its viscous properties, oxidizes and becomes saturated with metal shavings from the wear of rubbing pairs. Timely replacement working fluid is not just a recommendation, but a necessity to extend the service life of the unit. Ignoring signs of malfunction, such as a hum when turning the steering wheel or a stiff move, often ends in pump failure.

Correct selection of lubricant for Nissan Murano requires careful study of the manufacturer's specifications. Unlike some other brands, the Japanese concern strictly regulates the tolerances for its hydraulics. Using the wrong fluid can cause the rubber seals to swell, leak, and cause the entire system to lose its seal. In this article we will look in detail at what power steering fluid suitable for your car, how to correctly perform the replacement procedure and what mistakes car owners most often make.

Features of the hydraulic system Nissan Murano Z51

Control system design Murano Z51 It is highly reliable, but at the same time it is sensitive to the quality of the consumables used. The power steering pump, driven by a belt from the crankshaft, creates the pressure necessary to operate the steering rack pistons. The working fluid performs several functions at once: transmits force, lubricates parts and removes heat from the pump and rack.

It is important to understand that the system is sealed, but not completely closed in terms of chemical composition. Micro-ventilation occurs through seals and oil seals, and when heated, the liquid expands. The expansion tank is equipped with a level sensor and a float, which signals the driver about a critical drop in oil volume. If the level has dropped, it is urgent to find the cause of the leak, since the pump operation dry leads to its instant destruction in a matter of seconds.

On Nissan Murano the second generation uses a steering rack with electric power or hydraulics, depending on the market and configuration. For versions with classic hydraulic booster, compliance with service intervals is critical. The manufacturer does not specify strict replacement regulations, however, experienced mechanics recommend carrying out this procedure every 60,000 - 80,000 kilometers. Regular diagnostics allows you to identify the early stages of pump wear by changing the color and consistency of the oil.

Quality requirements and tolerances of working fluid

The main requirement for power steering fluid for Murano Z51 is to meet original Nissan specifications. The manufacturer recommends using only proven compounds to avoid chemical incompatibility with rubber seals. Most original liquids have a red or yellowish color and a specific odor.

The most common and recommended option is the original liquid Nissan PSF (Power Steering Fluid). It is designed specifically for the hydraulic systems of Nissan and Infiniti vehicles. It is also permissible to use analogues that are approved according to the specification NISSAN PSF or KL52-00-001. These compounds should not be confused with regular ATF gear oil, although some of them have similar properties.

• ✅ Original Nissan PSF - an ideal choice that provides maximum resource for all system nodes.
• ✅ Liquids with approval NISSAN PSF from leading brands (for example, Motul, Castrol) - an acceptable alternative in the absence of the original.
• ❌ Any liquids without a clear indication of approval for Nissan can cause destruction of seals and loss of tightness.

Many car owners are interested in whether it is possible to fill the power steering with ATF transmission fluid (for example, Dexron III or Dexron VI). In some older models this was acceptable, but for Murano Z51 this is a controversial decision. Modern seals are designed for a specific additive package in the original PSF. The use of ATF may cause changes in viscosity at low temperatures and loss of system pressure.

⚠️ Attention: The use of universal fluids “for all systems” is strictly not recommended for Murano Z51. The wrong chemistry can cause the steering rack seals to swell, causing a leak that cannot be fixed without completely replacing the seals.

Symptoms of malfunction and need for replacement

You can understand that it’s time to replace the fluid by a number of indirect signs that appear in the car’s behavior. The first and most obvious symptom is the appearance of extraneous noise when the steering wheel is rotated. If you hear a hum, whine or grinding noise, especially at standstill or at low speeds, this is a sure sign that the pump is overloaded due to aging oil.

The second important indicator is the change in steering effort. If the steering wheel has become heavier, especially when parking, or the force is supplied jerkily, this indicates a drop in pressure in the system. Also pay attention to the color of the liquid in the tank. The new liquid has a clear red or pink tint. If the oil turns black, cloudy, or contains metal particles, replacement is required.

Sometimes the problem can be hidden and appear only under extreme operating conditions, for example, in severe frosts. Thickened old fluid may not provide the necessary circulation, which will lead to difficulty turning the wheels at the start. Regular visual checking of the oil level and color in the expansion tank is the simplest method of prevention.

• 🔊 The appearance of a hum or howl of the pump when turning the steering wheel is the first signal to check the system.
• 🌡️ Deterioration of power steering performance on a cold engine (tight steering wheel before warming up) is a sign of oil oxidation.
• 🛢️ Changing the color of the liquid to dark, brown or black is a sign of critical wear of the additives.

Preparing for the oil change procedure

Before you start changing the fluid, you need to prepare the car and work area. The ideal option is a pit or overpass, since some of the work will have to be done from below. You will also need a set of tools: wheel wrenches (if you need to get to the hoses from below), a funnel, a container to drain the old oil and a rag.

Before starting work, make sure the engine is switched off and completely cooled down. This is necessary for safety, as the system is under pressure and hot liquid can cause burns. Check the oil level in the tank. If it is low, add some fresh fluid to prevent the pump from idling when draining. For Murano Z51 The system volume is approximately 1.5 liters, so purchase 2 liters of oil with a reserve.

It is important to prepare the system for flushing. If you plan to do a complete replacement, and not just top up, you will need to remove the hoses going from the reservoir to the pump. This is usually done by loosening the clamps. Be prepared for a significant amount of old fluid to leak out of the system. Place a container under the hoses and tank in advance.

⚠️ Attention: Do not unscrew the power steering reservoir cap while the engine is running! This could result in the release of hot fluid under pressure and injury. Always check the oil level and condition only with the engine off.

Step-by-step instructions for a complete fluid change

The procedure for completely replacing fluid in the power steering system Nissan Murano Z51 requires accuracy and consistency of actions. The most effective method is the displacement method. You need to drain the old oil, add new oil and bleed the system, repeating this process until clear fluid comes out.

First you need to remove the return hose (going from the rail to the tank) and lower it into the drain container. Start the engine and slowly turn the steering wheel from lock to lock. The old liquid will go into the container. As soon as the level in the reservoir begins to drop, add new fluid without allowing the pump to run dry. This process is repeated several times.

When clean, clear fluid flows from the drain hose, stop the engine. Reconnect the hose, making sure the connection is tight. Add oil to the maximum mark. Start the engine and turn the steering wheel several times, checking for abnormal noise and the oil level. If the level drops, add more. Complete replacement takes about 30-40 minutes.

After completing the procedure, be sure to check the tightness of all connections. Start the engine and let it idle. Carefully inspect the hoses and reservoir for leaks. If everything is in order, you can take a test drive. Pay attention to the operation of the steering wheel: it should rotate easily and smoothly, without jerking or noise.

Fluid compatibility table for Nissan Murano Z51

To make it easier to choose the right liquid, we have compiled a compatibility table. It contains original products and their high-quality analogues, which have been tested in practice and recommended by service center specialists.

Liquid type	Original number (OEM)	Compatibility	Color
Nissan Genuine PSF	KL52-00-001 / 999E0-10010	100% fit for Z51	Red
Motul PSF	106376	Recommended analogue	Red
Castrol CHF 11S	152083	Allowed, but requires verification	Green
Liqui Moly Zahnriemen	1114	Universal solution	Red

Please note that the color of the liquid can serve as a guide, but is not the main criterion. The main thing is the chemical composition and the presence of the necessary additives. Mixing liquids of different colors and manufacturers is strictly prohibited, as this may cause sedimentation and destruction of rubber seals. Always try to use the same type of oil each time you add or change.

If you are in doubt about choosing an analogue, it is best to contact an official dealer or consult a specialized auto mechanic. Saving on power steering fluid can lead to the need to replace the entire pump or steering rack, which will cost tens of times more than the cost of high-quality oil.

Frequent errors when servicing the power steering system

Even experienced drivers sometimes make mistakes when servicing the power steering system. One of the most common problems is ignoring the fluid level. Many owners check the level only when noise appears, which is already a delayed reaction. Regular inspection should be part of your technical regulations.

Another mistake is trying to eliminate noise by adding additives to old oil. Additives can temporarily dampen noise, but they do not restore the properties of oxidized oil or remove wear debris. This will only delay the inevitable repairs. If the system requires an oil change, do a complete change, not top up.

• 🚫 Do not use additives to “restore” power steering - they often mask the problem, exacerbating wear.
• 🚫 Do not allow the pump to operate without liquid even for a few seconds - this is a guaranteed failure.
• 🚫 Do not mix different types of liquids - a chemical reaction can lead to the formation of a gel and clogging the system.

It is also important to monitor the condition of the power steering pump drive belt. A loose belt can slip, causing a whistle and a drop in pressure in the system. The belt tension must correspond to factory settings. If the belt is worn or cracked, it must be replaced along with a fluid change.

What to do if after replacing the power steering continues to make noise?

If the noise remains after a complete fluid change, the cause may be the pump itself or the rack. Perhaps the pump bearing is worn out, or there is mechanical damage inside the rack. In this case, a diagnosis from a specialist is necessary.

FAQ: Frequently asked questions

Is it possible to mix red and yellow power steering fluid?

It is strictly not recommended to mix liquids of different colors and compositions. This can lead to a chemical reaction, sludge formation and seal failure. Use only one brand and type of fluid.

How often do you need to change the power steering fluid on a Nissan Murano Z51?

Nissan's official regulations do not provide for a hard replacement, but experts recommend carrying out this procedure every 60,000 - 80,000 km or once every 3-4 years, depending on operating conditions.

How much fluid is required for a complete replacement?

A complete replacement using the displacement method will require about 2 liters of liquid. The volume of the system itself is approximately 1.5 liters, but some of the old oil remains in the hoses and rack, so a reserve is necessary.

Why did the steering wheel become heavy after changing the oil?

This may be due to air getting into the system. It is necessary to bleed the power steering by turning the steering wheel from lock to lock with the engine running. If the problem persists, check the level and leaks.

Can Dexron ATF be used instead of original PSF?

For Murano Z51 This is not recommended. Although some mechanics allow the use of Dexron VI in extreme cases, it is better to use specialized Nissan PSF fluid to preserve the life of the pump and rack.