Changing the oil in an automatic transmission Nissan Pathfinder R51: a complete guide with nuances

Automatic transmission Nissan Pathfinder R51 (2005–2012) is a node that requires special attention. Many owners encounter problems: jerks when switching, delays in gas response, or even complete failure of the automatic transmission. Most often there is one reason - contaminated or outdated gear oil. The manufacturer claims that the fluid in the box is filled for the entire service life, but in practice it needs to be replaced every 60–80 thousand km (or once every 4–5 years).

In this article you will find unique data on oil selection for RE5R05A — it was this automatic transmission that was installed on Pathfinder R51 with engines VQ40DE (3.5 l) and YD25DDTi (2.5 diesel). We will analyze two replacement methods - partial and complete, taking into account the specifics of the box design. You will also learn why you cannot use cheap analogues and how to avoid mistakes that lead to expensive repairs.

When to change the oil in a Pathfinder R51 automatic transmission: signs and regulations

Official regulations Nissan does not provide for changing the automatic transmission oil Pathfinder R51, but this is a marketing ploy. In practice, the liquid degrades due to:

• 🔥 Overheating - especially relevant for diesel versions and cars driven in traffic jams.
• ⚙️ Mechanical wear — friction products of clutches and bearings clog the filter and valve body channels.
• 🕒 Aging additives — after 5–6 years, the oil loses its viscosity properties, even if the mileage is short.

Symptoms indicating the need for replacement:

• 🚗 Jerks or slipping when changing gears (especially from 1st to 2nd).
• 🔄 Delayed response to pressing the gas pedal (more than 1–1.5 seconds).
• 💧 Darkening of the oil (a black or brown tint is visible on the dipstick).
• 🔊 Extraneous noise (hum or grinding) when the box is operating.

⚠️ Attention: If metal particles are found in the oil or it smells like burning, this is a sign of critical wear of the clutches. In this case, changing the oil can only worsen the problem: fresh fluid will wash away the deposits that have clogged the valve body channels, and the box will stop working.

For Pathfinder R51 with automatic transmission RE5R05A optimal replacement intervals:

Operating conditions	Replacement interval	Replacement type
Light (road, moderate climate)	80–100 thousand km	Partial
Medium (city, mixed cycle)	60–70 thousand km	Partial or complete
Heavy (towing, off-road, heat/cold)	40–50 thousand km	Full with flushing

What kind of oil to fill in the Pathfinder R51 automatic transmission: original vs analogues

Box RE5R05A extremely sensitive to oil quality. Official recommendation Nissan - liquid Matic S (article KE908-99932). However, after 2012 it was discontinued, replaced by Matic J (KLE52-00004). But there is a nuance here:

• 🔧 Matic J has a different viscosity base and is not suitable for boxes,Released before 2010. Its use may lead to slipping of the clutches.
• 🛢️ Optimal choice — Nissan Matic S (if you find the original) or its analogues: Idemitsu ATF Type-S, Ravenol ATF JWS 3309, Motul Multi ATF.
• ❌ Prohibited liquids with markings Dexron III/VI or Mercon V - they are incompatible with clutch materials RE5R05A.

Oil volume to change:

• 🔄 Partial replacement (drain through the plug): 4–4.5 liters.
• 🔄 Complete replacement (with flushing): 9–10 liters (requires 2 canisters of 5 liters each).

⚠️ Attention: If you are using non-original fluid, be sure to check it for compatibility with JWS 3309 - this is the standard Nissan for automatic transmission Pathfinder R51. Non-compliance will lead to foaming and loss of pressure in the valve body.

Tools and consumables: what you need for replacement

To work you will need:

10 mm hex wrench (for drain plug)

14 mm socket wrench (for pallet)

New automatic transmission filter (part number 31726-31X01)

Pan gasket (item no. 31397-31X02 or equivalent Fel-Pro TOS18655)

Funnel with a narrow spout (for pouring through the dipstick)

Oil syringe (if filling through the control hole)

Carburetor cleaner (for flushing the pan)

Lint-free rags

Drain container (minimum 5 l)

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Pay special attention to the filter. B Pathfinder R51 used metal mesh filter, which can be washed (if it is not deformed). However, if it shows signs of severe contamination or damage, it is better to install a new one.

The pan gasket is disposable. Some craftsmen use sealant instead of a gasket, but this is fraught with leaks: when the oil heats up, the sealant can peel off.

Where can I buy consumables cheaper?

Many car owners order a filter and gasket for AliExpress (articles are the same, but the price is 2-3 times lower). However, be careful: about 30% of the parts are fakes. Check the seller's reviews and photos of real buyers. An alternative is stores like Exist.ru or Autodoc, where there is a guarantee of originality.

Step-by-step instructions: partial oil change in automatic transmission

Partial replacement is suitable if the oil is not very dirty and you monitor its condition. The procedure takes 1–1.5 hours.

1. Warm up the box. Drive 10–15 km or let the engine idle for 10 minutes. Warm oil drains better.

2. Place the machine on a pit or lift. Secure the wheels with chocks and engage the handbrake.

3. Drain the old oil. Place a container under the drain plug (it is located on the automatic transmission pan), unscrew it with a 10 mm hexagon. Wait until it drains completely (about 3-4 liters).

4. Wash the tray and magnets. Remove the tray (14 bolts), clean it and the magnets from metal shavings. Check the condition of the gasket - if it becomes dull or cracked, replace it.

5. Install a new filter. B RE5R05A The filter is secured with 3 bolts. Remove the old one, wash it or replace it with a new one. Don't forget to lubricate the O-ring with oil.

6. Fill with new oil. Use a funnel through the dipstick. Fill in the same amount as drained (usually 3.5–4 liters). Then check the level using the dipstick on a warm box (the engine should be running, the selector should be in position P).

⚠️ Attention: After replacing, drive 5–10 km and check the level again. If the oil is above the mark HOT on the dipstick, drain the excess through the control hole (10 mm plug next to the drain). Overfilling is just as dangerous as underfilling!

Complete automatic transmission oil change: displacement method

A complete replacement is required if the oil is heavily contaminated or the gearbox has been overheated. For this purpose the method is used replacing old oil with new oil through the automatic transmission cooler. You will need:

• 🔧 Special apparatus (can be rented at a car service station).
• 🛢️ 10–12 liters of oil (2-3 cans).
• ⚡ Assistant to control the process.

Algorithm of actions:

1. Disconnect the return hose from the automatic transmission cooling radiator (usually the lower hose).

2. Connect a transparent tube to the hose and lower it into the drain container.

3. Start the engine. Old oil will come out of the tube. As soon as it changes color to light (after about 1–1.5 liters), turn off the engine.

4. Add new oil through the dipstick (volume = drained). Repeat the process until clear liquid comes out of the tube.

5. Reset the automatic transmission adaptations (if you have access to a diagnostic scanner). This will help the box “get used” to the new oil.

Advantages of the method:

• ✅ Change 90–95% of oil (including fluid in the torque converter).
• ✅ Removing deposits from hydraulic unit channels.

Disadvantages:

• ❌ High oil consumption.
• ❌ Risk of airing the system if connected incorrectly.

What should I do if after replacement the box begins to twitch?

This is a normal phenomenon in the first 50–100 km - the new oil washes away deposits, and the valve body solenoids are “retrained”. If the jerking persists for longer, check:

1) Oil level (must be strictly between HOT minimum and maximum).

2) Quality of the liquid (some analogues foam when heated).

3) Connecting hoses (air leakage is possible).

Common mistakes when changing oil and how to avoid them

Even experienced technicians make mistakes that lead to automatic transmission failure. Here are the most common:

• 🚫 Using the wrong oil. For example, Dexron VI instead of Matic S. This leads to slipping of the clutches and wear of the valve body.
• 🚫 Incorrect oil level. Underfilling leads to oil starvation, overfilling leads to foaming and loss of pressure.
• 🚫 Ignoring pan flushing. Metal shavings remaining on the magnets will fall back into the box.
• 🚫 Replacement without resetting adaptations. After a complete oil change, the automatic transmission needs “training” - otherwise there will be jerks.

How to avoid problems:

• 🔍 Before changing, check the oil on the dipstick: if it smells like burning or is dark in color, it needs complete replacement with flushing.
• 📏 Use only original dipstick to check the level. On Pathfinder R51 it has unique markup.
• 🔧 After replacement, drive 10–15 km and recheck the level. Top up if necessary.

The cost of changing the oil in an automatic transmission Pathfinder R51: prices in 2026

The price depends on the replacement method and region. Average prices:

Replacement type	Cost of work (rub.)	Cost of consumables (RUB)	Total (RUB)
Partial (on your own)	0	3 500–5 000	3 500–5 000
Partial (in service)	1 500–2 500	3 500–5 000	5 000–7 500
Full (hardware)	3 000–5 000	8 000–10 000	11 000–15 000

Saving on oil changes is expensive: automatic transmission repair RE5R05A costs from 80,000 to 150,000 rubles. For example, replacing solenoids will cost 20–30 thousand rubles, and a major overhaul with replacement of clutches will cost 100+ thousand rubles.

Where is it cheaper to buy consumables:

• 🛒 Exist.ru — original filter (~2,000 rub.), gasket (~500 rub.).
• 🛒 Autodoc - analogues (Mahle, Febi) 20–30% cheaper.
• 🛒 Local stores are sometimes more profitable if you need urgent delivery.

FAQ: answers to frequently asked questions

Is it possible to mix different oils in a Pathfinder R51 automatic transmission?

No! Even if both oils meet the standard JWS 3309, their additives may react. For example, a mixture Nissan Matic S And Idemitsu Type-S sometimes leads to foaming. If you need to refill, use the same brand that was previously filled.

What happens if you don’t change the automatic transmission oil?

The consequences depend on the mileage:

• 🔹 100–150 thousand km: jerking, switching delays, increased fuel consumption.
• 🔹 150–200 thousand km: wear of friction clutches, slipping, transition to emergency mode.
• 🔹 200+ thousand km: destruction of the planetary mechanism, jamming of the valve body. Repairs will cost 100+ thousand rubles.

How to check the oil level without a dipstick?

On some versions Pathfinder R51 there is no dipstick (for example, on diesel models for Europe). In this case, the level is checked through the control hole:

1. Warm up the box to 60–70°C (drive 10 km).
2. Raise the car on the lift (it must be level!).
3. Unscrew the control plug (10 mm hexagon) on the pan.
4. If oil drips, the level is normal. If not, add it through the filler neck (located on top of the box, under the hood).

Is it necessary to flush the automatic transmission when changing the oil?

Flushing is only necessary in two cases:

• 🔹 The oil is heavily contaminated (black, with a burning smell).
• 🔹 The box worked with overheating (for example, after towing).

For rinsing use only original oil (not special flushing fluids!). Algorithm:

1. Drain the old oil.
2. Fill it with a new one, drive 50–100 km.
3. Drain and refill with fresh oil.

What kind of oil is poured into the Pathfinder R51 automatic transmission from the factory?

Filled from the factory Nissan Matic S (red). However, after 2010 Nissan switched to Matic J (green) which not compatible with RE5R05A. If your Pathfinder released before 2010, use only Matic S or its analogues (Idemitsu Type-S, Ravenol JWS 3309).