3.5 V6 engine on Nissan Murano: A complete guide to reliability and maintenance

Introduction: The Heart of the Crossover

When it comes to Nissan Murano, it is impossible not to mention its power unit - legendary VQ35DE or its modernized version VQ35HR. These gasoline engines with a volume of 3.5 liters have become the calling card of the brand, providing the car with dynamics worthy of sports cars, while remaining quite economical for its class. It is this engine that provides Murano with a record service life among its competitors, provided that the oil is changed in a timely manner and the condition of the timing chain is monitored.

Crossover owners often choose 3.5 l engine due to its linearity and throttle response. However, like any complex mechanism, it requires careful attention. Understanding the design features will help you avoid costly repairs and extend the life of your car. In this article we will analyze in detail the technical nuances, typical problems and methods for solving them.

Design features and modifications

VQ series motor installed on Nissan Murano first and second generations, is a 60-degree V-shaped cylinder gears. The main feature of the design is the use aluminum block cylinders, which significantly reduces the weight of the car and improves weight distribution. Forged inside pistons And crankshaft, designed for high speeds.

The first generation of the model (Z50) was equipped with a version VQ35DE (Double Overhead Camshaft). In more recent versions (Z51 and Z52), engineers introduced a modification VQ35HR (High Response). The key difference between the HR version was the increase in piston stroke and the use of two crankshafts for each bank of cylinders, which reduced inertia and increased power to 249–260 hp.

• 🔥 Power: from 234 to 260 horsepower depending on the year of manufacture.
• ⚙️ Gas distribution system: DOHC with phase shifters (CVTCS) on the intake and exhaust camshafts.
• 💧 Cooling: Fluid system with wide channels for efficient heat dissipation.

It's important to note that VQ35HR has a more complex intake system, where the intake manifold changes its geometry depending on the speed. This allows the engine to operate efficiently at both low and high speeds. However, this complexity requires more careful maintenance.

Lifetime and typical faults

Despite the high reliability, 3.5 l engine is not without "sores" characteristic of Japanese engines of this period. The main problem that owners face Nissan Murano, is a stretch timing chains. Due to the lack of hydraulic compensators, the valve clearances change, which requires attention to the noisy operation of the engine when cold.

Second critical point - coking oil separator in the crankcase ventilation system (CVG). This causes oil to begin to enter the intake manifold, settling on the throttle body and valves. As a result, the engine loses power and oil consumption increases sharply.

⚠️ Attention! If you notice bluish smoke from the exhaust pipe when accelerating hard, this is a sure sign that the oil seals or piston rings are worn out and serious diagnostics are required.

It's also worth mentioning the problem with camshafts. At high mileage (more than 150,000 km), scuffs may appear on the shaft journals, especially if low-quality oil was used. This is often accompanied by a characteristic knocking sound at the top of the engine.

• 🔧 Chain stretch: manifested by a “clunking” noise when starting a cold engine.
• 🌡️ Overheating: May be caused by a clogged radiator or a faulty thermostat.
• 💻 Sensors: Failure of camshaft position (CMP) sensors often causes valve timing errors.

Lubrication system and oil problems

For proper functioning VQ35 It is critical to use quality motor oil. Manufacturer recommends viscosity 5W-30 or 5W-40 depending on climatic conditions. The use of cheap analogues can lead to rapid failure hydraulic compensators And phase shifters.

One of the most common problems is maslozhor. Owners Murano Increased oil consumption is often noted, which can reach 1 liter per 1000 km. There are several reasons: stuck piston rings, worn oil seals and a malfunction of the crankcase ventilation system. Regularly checking the oil level is a mandatory procedure for every owner.

Remember to change the oil filter every time you change it. A clogged filter can cause oil starvation, which will lead to crankshaft liners turning. This is a catastrophic failure requiring major engine overhaul. It is also worth monitoring the condition valve stem seals, since rubber hardens over time and begins to leak oil into the combustion chamber.

⚠️ Attention! Never allow the oil level to drop below the minimum mark on the dipstick. The VQ35 engine is extremely sensitive to oil starvation, and even a few seconds of operation without oil can lead to seizure.

If you notice that the oil level is rising rather than falling, this may indicate that antifreeze has entered the lubrication system or that the fuel is diluting. In such cases, you must immediately stop the car and call a tow truck.

Cooling system and thermostats

Engine cooling system 3.5 l has its own characteristics. Main element - thermostat, which often fails, jamming in the open or closed position. If it is jammed open, the engine will take a long time to warm up, and if it is closed, it will overheat, which can lead to deformation of the cylinder head.

It is also worth paying attention to water pump (pump). Its resource is usually about 100,000 km. Signs of a pump malfunction are antifreeze leaking from under the bearing cap or a characteristic whistle when the engine is running. Regular condition check belt drive and tensioners will help avoid sudden breakdowns.

• ❄️ Antifreeze: Use only recommended types (eg Nissan Long Life Coolant), do not mix different colors.
• 🔥 Radiator: regularly clean the radiator honeycombs from fluff and dirt, especially in the spring.
• 🌡️ Temperature sensor: Its failure may result in incorrect readings on the instrument panel.

Engine overheating is not just a temperature issue, it is a threat to the integrity of the entire powertrain. At the first signs of overheating (the needle rises into the red zone), you must immediately stop, turn off the engine and let it cool. Opening the radiator cap on a hot engine is strictly prohibited.

Repair and maintenance: What you need to know

Engine repair VQ35 requires highly qualified mechanics and special equipment. Many procedures, such as replacing the timing chain or adjusting the valves, are performed only after the engine has been removed or a large number of attachments have been removed. This makes the cost of work quite high.

When planning maintenance, it is necessary to take into account the timing of replacement of main components. Timing chain with normal maintenance it lasts up to 200,000 km, but if noise occurs, it should be changed immediately. Spark plugs it is recommended to change every 60,000 km, and alternator belt - every 90,000 km.

Particular attention should be paid fuel injection system. The injectors on this engine can become dirty, which leads to unstable idling and failures during acceleration. Regular cleaning of the throttle body and injectors will help maintain the dynamics of the car.

Timing chain repair cost

Replacing the timing chain on a Nissan Murano 3.5 is an expensive procedure. The cost of the chain itself is about 15-20 thousand rubles, and replacement work (removing the engine, replacing tensioners, dampers) can cost 40-60 thousand rubles from an authorized dealer. In independent services the price will be lower, but the quality of spare parts must be checked carefully.

If you're planning a major renovation, consider installing improved piston rings or valve stem seals from modern materials. This can significantly extend the life of the engine and reduce oil consumption in the future.

Scale characteristics and comparison

For clarity, let’s compare the main characteristics of different engine modifications VQ35installed on Nissan Murano. This will help you understand the differences between the DE and HR versions, and which engine to choose when buying a used car.

Parameter	VQ35DE (Z50)	VQ35HR (Z51/Z52)
Volume (liters)	3.498	3.498
Power (hp)	234 / 245	260
Torque (Nm)	329	336
Intake type	Fixed	Variable (Dual Stage)
Resource (km)	up to 300,000+	up to 300,000+

As can be seen from the table, the HR version has a more advanced intake system, which gives an advantage in dynamics. However, its maintenance costs are higher. The DE version is considered simpler and more reliable, but less powerful. The choice between them depends on your priorities: economy or drive.

FAQ: Frequently asked questions

What is the real service life of the 3.5 engine in a Nissan Murano?

With timely maintenance and the use of high-quality oil, the service life of the VQ35 engine can exceed 300,000 kilometers. The key factors are the condition of the timing chain and the absence of overheating.

Why does the 3.5 engine eat oil?

Increased oil consumption (up to 1 liter per 1000 km) is usually caused by stuck piston rings, worn valve stem seals, or a malfunction of the crankcase ventilation system (CVG).

How often should the timing chain be replaced?

Officially, the chain is considered a maintenance-free element, but in practice it is recommended to check it after 150,000 km. If a cold noise (clunking) occurs, it must be replaced immediately.

Is it possible to put 5W-40 oil in this engine?

Yes, oil with a viscosity of 5W-40 is acceptable, especially in hot climates or at high mileage. However, for new engines the manufacturer recommends 5W-30.

What to do if the Check Engine light comes on?

It is necessary to conduct computer diagnostics. Common causes on the VQ35 are errors in valve timing (phase shifters), problems with oxygen sensors, or contamination of the throttle valve.