Automatic transmission oil for <em>Nissan Pathfinder R51</em>: how to choose and replace correctly

Nissan Pathfinder R51 - a reliable SUV, but its automatic transmission RE5R05A requires special attention. Not only driving comfort, but also the service life of the transmission depends on the quality and timeliness of changing the oil in the automatic transmission. In this article we will look at which oil is suitable for Pathfinder R51, how often to change it, and what mistakes during replacement can result in expensive repairs.

Many owners are faced with a dilemma: fill in the original Nissan Matic-S or a suitable analogue? We analyzed the manufacturer's recommendations, reviews from service centers and the experience of owners to give clear answers. You will also find step-by-step instructions for changing the oil, taking into account the features R51 and oil compatibility table.

What kind of oil to fill in automatic transmission Nissan Pathfinder R51?

The manufacturer recommends for Automatic transmission RE5R05A (installed on Pathfinder R51 from 2005 to 2012) original oil Nissan Matic-S (article KLE22-00004). This is a synthetic liquid ATF with a unique additive package developed specifically for boxes Nissan And Infiniti.

However, there are high-quality analogues on the market that are not inferior to the original in terms of characteristics, but are cheaper. The main thing is to choose oils with approval JWS 3309 or Matic-S. Among the tested options:

• 🔹 Idemitsu ATF Type-J - a complete analogue of the original, often used in Japanese services.
• 🔹 Mobil ATF 3309 - a popular choice among owners Pathfinder due to stable properties under high loads.
• 🔹 Castrol Transmax J — Suitable for severe operating conditions (towing, off-road).
• 🔹 Ravenol ATF JWS 3309 - German oil with improved antioxidant properties.

Important: oils with Dexron III or Dexron VI approval are not suitable for RE5R05A! Their use leads to slipping of the clutches and accelerated wear of the box.

Frequency of automatic transmission oil changes: myths and reality

In the official manual Nissan indicated that the oil is in the automatic transmission Pathfinder R51 filled for the entire service life. But this is only true for “ideal” operating conditions: moderate climate, no towing, city mode without traffic jams. In reality, the oil resource is limited:

• 🔧 60,000 km — recommended interval for partial replacement (drain/fill).
• 🔧 90,000–120,000 km — complete replacement with washing (hardware method).
• 🔧 40,000–50,000 km — under difficult conditions (frequent towing, off-road driving, hot climate).

Signs that it's time to change the oil:

• 🚨 Jerks or delays when changing gears.
• 🚨 Extraneous noises (hum, grinding) from the automatic transmission.
• 🚨 Darkening of the oil (black color or metal shavings on the dipstick).
• 🚨 Burning smell from transmission fluid.

Step-by-step instructions for changing automatic transmission oil

Changing the oil in RE5R05A can be performed in two ways: partial (drain/fill) and full (with flushing). For Pathfinder R51 The partial method is optimal, since it has less risk of washing out useful deposits in the hydraulic unit. Let's look at the process in detail.

Required tools and materials:

• 🔧 New oil (4–5 liters for a partial change, 10–12 liters for a complete change).
• 🔧 New automatic transmission oil filter (article no. 31726-31X01).
• 🔧 O-ring of the pallet (article 31397-31X00).
• 🔧 10 mm wrench and 24 mm socket (for drain plug).
• 🔧 Funnel with a thin spout and a hose for pouring.
• 🔧 Container for draining waste (at least 5 liters).
• 🔧 Clean rags and gloves.

Procedure:

1. Warm up the engine to operating temperature (60–80°C) so that the oil becomes less viscous.

2. Lift the car on a lift or drive it onto an overpass. Make sure the car is level.

3. Remove the crankcase protection (if equipped) and unscrew the drain plug with a 24 mm wrench. Be careful - the oil will be hot!

4. Wait until the oil is completely drained (~3.5–4 liters will flow out). Assess the condition of the waste: if there are a lot of metal shavings in it, automatic transmission diagnostics will be required.

5. Unscrew the pan bolts (10 mm) and carefully remove it. Clean the magnets from shavings and wash the tray with gasoline or a special cleaner.

6. Replace the automatic transmission filter. B RE5R05A it is located inside the box and is secured with 3 bolts.

7. Install a new pan gasket and tighten the bolts crosswise (tightening torque: 10 Nm).

8. Tighten the drain plug with a new washer (torque - 35 Nm).

9. Fill in new oil through the dipstick hole. Use a funnel with a hose to avoid spills.

10. Start the engine and warm up the automatic transmission by alternately switching the selector to all positions (with a delay of 5–10 seconds). Check the oil level and add if necessary.

Important: After replacement, avoid sudden acceleration and towing for the first 100–200 km. This will help the new oil distribute evenly throughout the system.

Errors when changing oil that kill automatic transmissions

Even experienced craftsmen sometimes make mistakes that reduce the resource RE5R05A. Here are the most critical of them:

⚠️ Attention: Never mix oils from different brands or types (e.g. Matic-S And Dexron VI). This leads to foaming of the liquid and loss of lubricating properties.

• 🚫 Incorrect oil level. Both deficiency and excess are harmful: the first leads to oil starvation, the second to foaming and high blood pressure.
• 🚫 Ignoring filter replacement. The old filter becomes clogged with wear products and stops passing oil, which leads to overheating of the automatic transmission.
• 🚫 Use of flushing additives. B RE5R05A they can wash away useful deposits in the valve body, causing the solenoids to malfunction.
• 🚫 Changing the oil without warming up. Cold oil is not completely drained, and up to 30% of the waste remains in the system.
• 🚫 Incorrect tightening of pallet bolts. Weak tightening leads to leakage, excessive tightening leads to deformation of the pan.

Critical error: using oil with a viscosity that is not appropriate for the climate. For example, in frosts below -30°C Matic-S may thicken, making cold starting difficult.

Comparison of automatic transmission oils Pathfinder R51: table

Manufacturer	Oil name	Tolerance	Volume (l)	Average price (per 1 l)	Features
Nissan	Matic-S	JWS 3309	4	1 200 ₽	Original, optimal for warranty service
Idemitsu	ATF Type-J	JWS 3309	4	900 ₽	The best analogue, used in Japanese services
Mobil	ATF 3309	JWS 3309	1/4	850 ₽	Good thermal stability, suitable for heavy loads
Castrol	Transmax J	JWS 3309	1	800 ₽	Improved antioxidant properties
Ravenol	ATF JWS 3309	JWS 3309	1	950 ₽	German quality, suitable for extreme temperatures

When choosing oil, pay attention not only to the price, but also to reviews from owners Pathfinder R51. For example, Idemitsu ATF Type-J often praised for smooth shifting, and Mobil ATF 3309 — for stability when towing.

Partial vs full replacement: which is better for RE5R05A?

Among the owners Pathfinder R51 There is no consensus on which oil change method is preferable. Let's look at the pros and cons of each:

Partial replacement (drain/fill):

• ✅ Less risk. Useful deposits in the hydraulic unit are not washed out.
• ✅ Cheaper. Requires 4–5 liters of oil instead of 10–12.
• ✅ Faster. It takes 1–1.5 hours versus 3–4 hours for a complete replacement.
• ❌ Incomplete drain. ~30–40% of old oil remains in the system.

Complete replacement (hardware flushing):

• ✅ 100% oil renewal. All contaminants are removed.
• ✅ Restoring the operating properties of automatic transmissions. Improves smoothness of switching.
• ❌ Risk of sediment washout. The solenoids in the valve body may become clogged.
• ❌ Expensive. Requires special equipment and 2-3 times more oil.

Recommendation: For Pathfinder R51 with mileage up to 150,000 km, partial replacement every 60,000 km is optimal. After 150,000 km, you can consider a complete replacement, but only if there are no signs of wear on the automatic transmission (jerking, slipping).

Signs of automatic transmission malfunction after incorrect oil change

If the oil change was performed incorrectly, RE5R05A may begin to behave unpredictably. Here are typical symptoms of problems:

• 🔴 Jerks when switching (especially from 1st to 2nd or from 3rd to 4th gear).
• 🔴 Switching delays (The automatic transmission “thinks” for 1–2 seconds before reacting).
• 🔴 Vibrations or shocks when starting off.
• 🔴 Power Loss (the engine “does not pull”, the revolutions increase, but the speed does not).
• 🔴 Noise in the box (hum, grinding or whistling).
• 🔴 Oil leak (oil stains under the car).

If at least one of these symptoms appears after changing the oil, you must:

1. Check oil level (must be between marks HOT on the dipstick when the automatic transmission is warm).
2. Rate oil color and smell (black color or burning smell is a sign of overheating).
3. Swipe error diagnosis (for example, using a scanner Launch X431).
4. If symptoms persist, contact service for testing. pressure in the valve body and state solenoids.

⚠️ Attention: If after changing the oil the automatic transmission stops shifting at all, stop immediately! Further operation may lead to destruction of the planetary mechanism. In this case, a tow truck and disassembly of the box is required.

What to do if the automatic transmission “kicks” after changing the oil?

If jerking appears immediately after replacement, most likely the problem is an incorrect oil level or its quality. Try draining 200–300 ml of oil and checking the operation of the box. If the jerking persists, an incompatible oil may have been used (for example, Dexron instead of Matic-S). In this case, a complete replacement with flushing is required.

FAQ: Frequently asked questions about automatic transmission oil Nissan Pathfinder R51

Can Dexron VI oil be used instead of Matic-S?

No, absolutely not. Dexron VI has a different viscosity and an additive package that is incompatible with clutches RE5R05A. Its use leads to gear slippage and accelerated wear of the gearbox. If you can't buy Matic-S, choose oils with approval JWS 3309 (For example, Idemitsu ATF Type-J).

How much oil is needed for a complete change in the Pathfinder R51 automatic transmission?

For a complete replacement (hardware method) you will need 10–12 liters oils This is due to the fact that up to 4–5 liters of old oil remain in the system (torque converter, lines, radiator), which are washed out with new oil during the flushing process. For partial replacement, it is enough 4–5 liters.

How to check the oil level in a RE5R05A automatic transmission?

The check is performed on a heated box (oil temperature 60–80°C):

1. Place the car on a level surface.
2. Start the engine and alternately switch the selector to all positions (with a delay of 5 seconds), then return to P.
3. Remove the dipstick, wipe it with a clean cloth and insert it back.
4. Take the dipstick out again and check the level: it should be between the marks HOT.

If the level is below normal, add oil in small portions (50–100 ml each), constantly checking the dipstick.

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

Over time, the oil loses its properties:

• 🔸 Lubrication of rubbing parts worsens, which leads to accelerated wear planetary mechanism and bearings.
• 🔸 Wear products (metal shavings) clog filter and solenoids, causing switching failures.
• 🔸 The oil oxidizes and forms varnish deposits, which block the valve body valves.
• 🔸 Overheated liquid loses viscosity, which leads to clutch slippage and jerks.

This could end up turning out to be overhaul of automatic transmission (from 80,000 ₽) or its replacement (from 200,000 ₽).

Is it possible to mix oils from different manufacturers, but with JWS 3309 approval?

In emergency cases (for example, when topping up on the road), mixing oils is allowed same type (For example, Nissan Matic-S And Idemitsu ATF Type-J). However:

• 🔹 Do not mix oils with different bases (mineral + synthetic).
• 🔹 After mixing ASAP perform a complete oil change.
• 🔹 Avoid mixing if the oils have different colors or smells (a sign of additive incompatibility).