Changing the oil in a Nissan Dayz variator: how to do it right and not ruin the box

CVT Nissan Dayz - one of the most reliable continuously variable transmissions in the compact van class, but only if it is serviced promptly and correctly. Many owners mistakenly believe that There is no need to change the CVT oil, relying on the myth of the “maintenance-free” variator. In practice, ignoring replacement leads to belt slipping, overheating and expensive repairs already after 100,000 km.

This article is not just instructions - it contains unique data on the specifics of the RE0F10D variator, which is installed on Dayz since 2013, including the features of partial and complete oil changes, the choice of original and analog fluids, as well as pitfalls that even official dealers are silent about. We'll figure out why replacement every 40,000–60,000 km critical for Japanese operating conditions, but may vary for Russia, and how to correctly adapt the intervals to your driving style.

Why does the Nissan Dayz CVT require a special approach to changing the oil?

CVT RE0F10D, installed on Nissan Dayz (including restyled versions 2016 and 2020), belongs to the family chain CVT with torque converter. Its key feature is the use of a special chain instead of a traditional belt, which increases reliability, but also places strict demands on the quality of the oil. Unlike classic automatic transmissions, where ATF fluid primarily performs a lubricating function, in a CVT the oil works as:

• 🔹 Hydraulic medium for transmitting torque in a torque converter;
• 🔹 Lubrication for chain, cones and bearings;
• 🔹 Coolant, removing up to 70% of heat from rubbing surfaces;
• 🔹 Antifriction composition, preventing chain slippage.

That's why conventional gear oils (for example, Dexron III) are absolutely not suitable - they do not contain an additive package to protect the chain from stretching and do not withstand high temperatures (up to 120°C at peak loads). Original liquid Nissan CVT Fluid NS-3 was developed taking into account:

• 🔬 Reduced viscosity at low temperatures (for cold starts);
• 🔥 Increased thermal-oxidative stability;
• 🛡️ Special anti-seize additives for chains.

In addition, the variator Dayz sensitive to overheating — when towing a trailer or aggressive driving, the oil degrades 2-3 times faster. This leads to:

⚠️ Attention: If you regularly tow a trailer or drive with a full load, the CVT oil change interval Nissan Dayz needs to be reduced to 30,000–35,000 km. Ignoring this rule leads to stretching of the chain and the appearance of a characteristic “hum” during acceleration.

Replacement frequency: official recommendations vs reality

Manufacturer in the manual for Nissan Dayz indicates that there is oil in the variator "does not require replacement during the entire service life" - but this is only true for the “ideal” conditions of Japan: moderate climate, smooth roads and gentle driving style. In Russian realities, such recommendations lead to CVT failure already at 80,000–100,000 km.

Experts and experienced owners recommend the following intervals:

Operating conditions	Recommended replacement interval	Replacement type
City mode (traffic jams, frequent acceleration)	40,000–50,000 km	Partial (30–40% volume)
Mixed mode (highway + city)	50,000–60,000 km	Partial or complete
Aggressive driving, towing, off-road	30,000–35,000 km	Full with flushing
Extreme conditions (extreme heat/cold)	35,000–45,000 km	Complete + filter replacement

It is important to consider that complete oil change (with removal of the pan and washing) is required no more than once every 100,000–120,000 km. In other cases it is enough partial replacement, which allows you to update 30–40% of the fluid without the risk of damaging the solenoids or valve body. However, even partial replacement must be carried out at least once every 2 years, since oil oxidizes over time, regardless of mileage.

What kind of oil to pour into the Nissan Dayz variator: original vs analogues

Officially, the manufacturer recommends using only Nissan CVT Fluid NS-3 (article KLE52-00004 for a 4-liter canister). This fluid was developed specifically for CVTs of the family RE0F10 and has a unique additive package that prevents:

• 🔗 Chain stretching;
• 🔥 Overheating of cones;
• 🛑 Formation of deposits on solenoids.

However, there are also high-quality analogues on the market that can be used only if it is impossible to buy the original:

Brand	Liquid name	Article	Notes
Idemitsu	CVT Fluid Type-J	30050037-72540	Complete analogue of NS-3, used on the Mitsubishi assembly line
Ravenol	CVT Fluid J1J1006	4014835734817	Contains molybdenum additives, suitable for harsh conditions
Motul	Multi CVT Fluid	105777	Universal fluid, but requires more frequent replacement

⚠️ Attention: Never use oils labeled Dexron VI or ATF - they are not compatible with CVTs Nissan! Also avoid generic "CVT fluids" without specification NS-3 or Type-J. Their use leads to chain slippage and premature wear of the cones.

Oil volume in the variator Nissan Dayz depends on the type of replacement:

• 🔧 Partial replacement: 3.5–4 liters;
• 🔧 Complete replacement (with removal of the pan): 7.5–8 liters;
• 🔧 Complete replacement with flushing: up to 10 liters (used to displace old oil).

Preparing for replacement: tools and consumables

To change the oil in the variator yourself Nissan Dayz you will need:

New oil (minimum 4 liters for a partial change)|New CVT filter (part number 31726-3MX0A)|Pan O-ring (part number 31397-3MX0A)|10 mm wrench for drain plug|Funnel with thin spout for filling|Container for draining waste (minimum 5 liters)|Gloves and rag|Torque wrench (for tightening the plug with a torque of 35 Nm)-->

Pay special attention variator filter. B Nissan Dayz two types of filters are used:

1. Coarse cleaning (metal mesh in the tray) - it can be washed and reinstalled;
2. Fine cleaning (paper filter inside the box) - requires mandatory replacement during a complete oil change.

If you are planning complete replacement, additionally prepare:

• 🔧 Flushing fluid (For example, Liqui Moly CVT Reiniger);
• 🔧 New magnet for pallet (article 31733-3MX00);
• 🔧 Sealant to seal the pallet (for example, ThreeBond 1217).

What happens if you don’t replace the magnet in the tray?

An old magnet loses its properties and ceases to catch metal shavings that are formed during the operation of the chain and cones. This leads to the circulation of abrasive particles in the oil and accelerated wear of the solenoids. In advanced cases, chips can clog the oil channels of the valve body, which will require a major overhaul of the variator.

Step-by-step instructions for changing the oil in the variator

The process of changing the oil in the variator Nissan Dayz can be divided into two scenarios: partial (for regular maintenance) and full (in case of severe contamination or after purchasing a used car). Let's consider both options.

Partial oil change (without removing the pan)

This method allows for 30-40% oil renewal and is suitable for routine maintenance. Procedure:

1. Warm up the variator to operating temperature (drive 10–15 km or let the engine idle for 5–7 minutes).

2. Place the car on a flat surface (it is better to use a lift or inspection pit). Secure the wheels with chocks.

3. Remove the engine protection (if equipped) and find drain plug on the variator tray (it is located closer to the rear of the box).

4. Place the drain container and unscrew the plug with a 10 mm wrench. Let the oil drain (about 3.5–4 liters).

5. Screw the plug back to a torque 35 Nm (do not overtighten!).

6. Remove the variator dipstick (located to the right of the engine, next to the battery) and insert a funnel.

7. Fill in new oil in a volume equal to the drained amount. Check the level on the dipstick (should be between the marks MIN And MAX in the zone HOT).

8. Start the engine and let it run for 2-3 minutes. Switch the variator selector through all positions (P-R-N-D) with a delay of 5 seconds. Recheck the oil level.

Complete oil change (with pan removal)

This method requires more time and tools, but can renew up to 80-90% of the oil. Step by step instructions:

1. Follow steps 1–4 from the instructions for partial replacement (draining the oil).

2. Unscrew all the bolts of the variator pan (14 pieces, 10 mm wrench). Be careful - about 1 liter of oil will remain in the pan!

3. Remove the pan and clean it of old sealant and deposits. Wash the magnets with gasoline or acetone.

4. Replace the coarse filter (rinse or install a new one). To replace the fine filter, you will need to remove the hydraulic unit - this operation is best left to specialists.

5. Install a new seal or apply sealant to the pan. Tighten the bolts crosswise to a torque of 10 Nm.

6. Fill in new oil through the dipstick (about 4 liters). Start the engine and let the variator operate in mode D 3–5 minutes.

7. Drain the oil again (this will remove any remaining old fluid from the torque converter). Fill in the final volume of oil (another 3.5–4 liters).

8. Check the level and take it for a test drive. After the variator has cooled down (after 1–2 hours), check the level again.

Typical mistakes when changing the oil in a Nissan Dayz CVT

Even experienced car owners make mistakes that can lead to serious damage to the variator. Here are the most common:

• 🚫 Using the wrong oil (For example, Dexron VI or universal ATF). This leads to chain slippage and overheating.
• 🚫 Underfilling or overfilling of oil. A low level leads to oil starvation, a high level leads to foaming and loss of properties.
• 🚫 Ignoring filter replacement. A clogged filter increases system pressure and can damage the solenoids.
• 🚫 Tightening the drain plug without a torque wrench. Overtightening leads to thread breakage, weak tightening leads to leakage.
• 🚫 Flushing the variator under pressure at non-specialized service stations. This can wash away critical deposits, causing slippage.

Another common mistake is changing the oil "cold". In this case, up to 1.5 liters of thick liquid remains in the pan, which then mixes with the new one and worsens its properties. Always warm up the variator before draining!

⚠️ Attention: If, after changing the oil, the sign on the dashboard lights up AT (transmission fault indicator), stop immediately and check the oil level. Driving with the light on may result in the variator locking in emergency mode.

Signs that the oil in the Nissan Dayz variator needs to be replaced urgently

If you haven't been keeping up with your replacement intervals, look out for the following symptoms:

• 🔴 Jerks during acceleration (especially at speeds of 40–60 km/h);
• 🔴 Delay when switching from P on D or R;
• 🔴 Hum or whistle when driving (indicates bearing wear);
• 🔴 Darkening of the oil on the dipstick (should be transparent with a reddish tint);
• 🔴 Burning smell from under the hood;
• 🔴 Deterioration in dynamics (the variator is “stupid” when overtaking).

If you observe at least 2-3 of these signs, don't put off changing the oil - delay can result in repairs costing 150,000–200,000 rubles. In advanced cases, variator RE0F10D begins to “kick” even at idle, which indicates critical wear of the chain or cones.

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If the variator begins to “slip” (engine speed increases, but the car does not accelerate), this is a sign of complete wear of the chain. In this case, changing the oil will no longer help - a major overhaul or replacement of the gearbox is required.

FAQ: Frequently asked questions about changing the oil in the Nissan Dayz CVT

Can NS-2 oil be used instead of NS-3?

No, NS-2 has a different additive package and is not suitable for CVTs RE0F10D. Its use will lead to accelerated wear of the chain and solenoids. NS-3 backwards compatible with NS-2, but not vice versa.

How much does it cost to change the oil in a Dayz CVT at an official dealer?

The cost depends on the type of replacement:

• Partial replacement: 3,000–4,500 rubles (excluding oil);
• Complete replacement: 8,000–12,000 rubles (including washing and replacing the filter).

Replacing it yourself will cost 2–3 times less, but requires care.

What should you do if, after changing the oil, the variator begins to twitch?

The reasons may be as follows:

1. Poor quality or fake oil;
2. Incomplete drainage of old fluid (replacement required);
3. Solenoid contamination (needs diagnostics);
4. Incorrect oil level (check the dipstick on a warm box).

If the jerking does not go away after repeated replacement, contact a diagnostician to check the pressure in the valve body.

Do I need to adapt the variator after changing the oil?

In most cases, adaptation is not required, since the electronic control unit (ECU) of the variator automatically adapts to new conditions. However, if you notice delays when switching, you can reset adaptations through the diagnostic scanner (for example, Launch X431) or by disconnecting the battery terminal for 10 minutes.

Is it possible to mix NS-3 oil with analogues (for example, Idemitsu Type-J)?

Theoretically it is possible, since Idemitsu Type-J - this is the same NS-3, but under a different brand. However Mixing different brands is not recommended, as additives may react. If you had to add an analogue, perform a complete oil change as soon as possible.