Changing the oil in a Nissan Almera N16 manual transmission: a complete guide with nuances

Manual transmission Nissan Almera N16 (2000–2006) is famous for its reliability, but only subject to timely maintenance. Many owners mistakenly believe that There is no need to change the manual transmission oil — they say, it is filled “for its entire service life.” In practice, transmission fluid loses its properties after 80–100 thousand km, and even earlier during aggressive driving or in the Russian climate. Ignoring replacement leads to accelerated wear of synchronizers, bearings and even gears.

This article is not just instructions, but unique guidance taking into account the specifics Almera N16where is the box RS5F31A (5-mortar) or RS5F32A (6-mortar for restyling) requires a special approach. We will analyze: what kind of oil to pour (including analogues of the original), how to drain waste without a hole, how much fluid is needed, and why the first gear may crunch after replacement. And also typical errors, due to which the box begins to “howl” a month after the service.

Why is there oil in a manual transmission? Almera N16 needs to be changed, even if “the manufacturer does not recommend”

In the official manual Nissan There really is no regulation for changing the oil in a manual transmission. But this does not mean that the liquid is eternal. Gear oil performs three key functions:

• 🔧 Lubrication — reduces friction between gears and bearings, preventing scuffing.
• 🧊 Cooling — removes heat from heated parts (especially important for boxes with synchronizers made of brass).
• 🧹 Cleaning — retains wear products (metal dust, friction particles).

Over time, the oil oxidizes, loses viscosity and accumulates abrasive particles. Consequences of ignoring replacement:

Mileage without replacement	Symptoms	Consequences
60–80 thousand km	Difficult switching to cold, slight crunch when turning on the rear	Wear of synchronizers 1–2 gears
100–120 thousand km	Extraneous noise (howling) in neutral, spontaneous gear shifting	Destruction of secondary shaft bearings
150+ thousand km	Difficulty switching, metallic grinding noise	Critical gear wear, major repair required

It is especially critical to change the oil if:

• 🚗 The car is used in the city (frequent starts/stops speed up the wear of the synchronizers).
• ❄️ In winter, the temperature drops below -20°C (thickened oil does not lubricate parts well during cold starts).
• 💨 The box “slips” due to a worn clutch (wear products get into the oil).

⚠️ Attention: If, when checking the oil level on the dipstick (if any), you see black liquid with metallic glitter - this is a signal for an urgent replacement. In advanced cases, it may be necessary to wash the box with a special compound.

What kind of oil to pour into a manual transmission Almera N16: original vs analogues

The official manual prescribes for Almera N16 oil with classification API GL-4 and viscosity 75W-80 or 75W-90. Original liquid from Nissan — KE908-99931 (1 l) or KE908-99932 (4 l), but it is difficult to find, and the price is steep (from 1,200 rubles / liter). Fortunately, there are worthy analogues:

Manufacturer	Article	Viscosity	Volume, l	Notes
Mobil	153622	75W-90	1	Semi-synthetic, suitable for cold climates
Castrol	157F1F	75W-80	1	Synthetic, improved anti-wear properties
Liqui Moly	2031	75W-90	1	High viscosity index, recommended for used boxes
Motul	105784	75W-80	1	Suitable for soft alloy synchronizer boxes

Important nuances of choice:

• 🔹 Do not use GL-5 oil - it is intended for axles and gearboxes, and not for synchronized boxes. Its aggressive additives destroy brass synchronizers.
• 🔹 For regions with frosts below -30°C, it is better to choose 75W-80 - it thickens less in the cold.
• 🔹 If the transmission “howls” in neutral, try oil with friction modifiers (for example, Red Line MT-90).

Oil volume to change:

• 🔧Box RS5F31A (5-mortar) — 2.8–3.0 l.
• 🔧Box RS5F32A (6-speed, restyling) — 3.1–3.3 l.

⚠️ Attention: If you decide to mix oils from different brands, make sure they have the same base (synthetic/semi-synthetic) and classification GL-4. Mixing mineral water with synthetics can lead to sedimentation.

Tools and materials: what you need for replacement

You don't need any specialized equipment to work—a basic set is enough. Here's the full checklist:

New gear oil (3-3.5L)|24mm wrench (for drain plug)|17mm wrench (for filler plug)|Funnel with flexible hose (8-10mm diameter)|Waste container (4-5L capacity)|Gloves and rags|Torque wrench (optional, for precise tightening)|Flushing oil (if required cleaning the box) -->

Additional devices that will facilitate the process:

• 🔧 Key extension — the drain plug is often located in an inconvenient place.
• 🔧 Key magnet - will help hold the plug when unscrewing (it may fall into the container with oil).
• 🔧 Syringe for filling (if there is no funnel) - a 20 ml medical one with a tube will do.

If you are planning washing the box, you will additionally need:

• 🧴 Special flushing oil (for example, Liqui Moly Getriebe-Reiniger).
• 🔧 Key for the filter (if a removable filter is installed on the box - rare, but it does occur).

It is better to do the work on hole, overpass or lift. If you don’t have any of this, you can get by with a jack, but then you will need wheel supports and safety stands.

What to do if there is no pit or lift?

Jack up the front of the car on both sides and place safety stands under the rear wheels. The drain plug can be unscrewed by lying on your back under the machine (use a board to distribute the weight). To fill the oil, you will have to remove the left front wheel - the filler hole is located closer to the arch.

Step-by-step instructions: how to drain the old oil and fill in new oil

The process of changing the oil in a manual transmission Almera N16 takes about 1–1.5 hours. Follow the algorithm:

Step 1: Warm up the oil

Start the engine and let it run for 5-10 minutes. The transmission oil should heat up to 40–50°C - this will make it less viscous and drain faster. Do not heat the box for more than 15 minutes - this is pointless and dangerous (you can get burned on hot parts).

Step 2: Drain waste

Algorithm:

1. Turn off the engine and put the car on the handbrake.
2. Place the waste container under the drain hole (it is located in the lower part of the box housing).
3. Using a 24 mm wrench, unscrew the drain plug. Be careful - the oil will be hot!
4. Wait until the liquid has completely drained (10–15 minutes).
5. Wipe the plug with a rag and inspect it for metal shavings. If there are a lot of chips, the box requires diagnostics.

If the oil does not drain or flows in a thin stream, it means:

• 🔹 The drain hole is clogged (needs to be cleaned with wire).
• 🔹 The oil is too thick (maybe mineral water was filled in earlier).

Step 3: Wash the box (optional)

Flushing is needed if:

• 🔧 The oil was black with large metal particles.
• 🔧 The box was previously serviced unknown when.
• 🔧 After changing the oil, noise or crunching remains.

For washing:

1. Screw in the drain plug.
2. Pour 1–1.5 liters of flushing oil through the filler hole.
3. Start the engine and let it run for 5-10 minutes in neutral, periodically shifting gears.
4. Drain the wash and repeat the procedure with fresh oil.

Step 4: Add new oil

There is a nuance here: in Almera N16 the filler hole is located on the side of the box housing, not from above. To add oil:

1. Insert a funnel with a flexible hose into the filler hole.
2. Slowly add oil. Don't overfill! The level should be at the bottom edge of the hole.
3. Tighten the plug to a torque of 30–40 Nm (do not overtighten!).

Check the oil level:

• 🔹 If there is a dipstick, it should show between MIN And MAX.
• 🔹 If there is no dipstick, the oil should begin to flow out of the filler hole when the level is exceeded.

Common mistakes when changing oil and how to avoid them

Even experienced car owners make mistakes, which later become costly. Here are the most common:

Error	Consequences	How to avoid
Oil overflow	Foams, loses properties, crushes seals	Fill to the edge of the hole, no more
Using GL-5 oil	Destruction of synchronizers, crunching noise when switching	Only GL-4 with approval for Nissan
Insufficient heating before draining	Up to 300 ml of old oil remains in the box	Warm up for at least 10 minutes
Tightening plugs without a torque wrench	Thread breaks or oil leaks	Tightening torque: 30–40 Nm

A few more pitfalls:

• 🔧 Using sealant on plugs — it can get into the box and clog the oil receiver. The plugs must be screwed dry if the threads are not damaged.
• 🔧 Changing the oil after clutch repair — if dust from a worn disk gets into the box, you first need to wash it with a special liquid.
• 🔧 Ignoring metal shavings on the plug - if there is a lot of it, the box requires diagnostics, and not just an oil change.

⚠️ Attention: If, after changing the oil, the transmission begins to “howl” in neutral or the gears are engaged with force, it is possible that low-quality oil was filled in or its level was exceeded. In this case, you need to repeat the drain/fill procedure.

What to do if problems arise after changing the oil

Sometimes, even after proper oil changes, malfunctions occur. Let's look at the most common ones:

Problem 1: Crunching sound when engaging first gear

Possible reasons:

• 🔹 Oil does not match viscosity (too thick for cold climates).
• 🔹 Worn out first gear synchronizer (box repair required).
• 🔹 Insufficient oil level (check and top up).

Problem 2: The transmission “howls” in neutral

This is a sign:

• 🔹 Wear of primary/secondary shaft bearings.
• 🔹 Low-quality oil (for example, fake).
• 🔹 Oil overflow (excess creates foaming).

Solution:

1. Drain the oil and check its condition. If it is black or has metal particles, the box needs repair.
2. If the oil is normal, but the noise remains, try replacing it with a more viscous one (for example, with 75W-80 on 80W-90).

Problem 3: Oil leaking from the plugs

Reasons:

• 🔹 The thread on the plug or crankcase is damaged.
• 🔹 The cork is twisted with skew or insufficient torque.
• 🔹 An unsuitable gasket was used (for example, from another model).

Solution:

• 🔹 If the thread is damaged, cut a new one (of larger diameter) or install an insert.
• 🔹Tighten the cork with torque 30–40 Nm.
• 🔹 Use original gaskets Nissan (article 11026-01M02).

What to do if after changing the oil the transmission does not move?

If, after changing the oil, the gears do not engage or the car does not move, it is possible:

1. Oil has not been filled (check the level).

2. Oil of the wrong viscosity was poured (for example, ATF instead of GL-4).

3. When draining, the crankcase gasket was damaged and oil leaked out.

Immediately turn off the engine and check the level!

FAQ: Frequently asked questions about changing oil in manual transmissions Almera N16

Is it possible to mix oils from different brands?

You can mix, but only if they have the same base (synthetic/semi-synthetic) and classification GL-4. However, it is better to avoid this - different additives may react. If you had to mix, make a complete replacement as soon as possible.

How often do I change the oil if I only drive around town?

In city mode (frequent starts/stops), the oil in the manual transmission wears out faster. The optimal interval is every 60 thousand km or once every 3–4 years (whichever comes first).

What happens if you overfill the oil?

Overfilling causes the oil to foam, which impairs lubrication and can push out the seals. Symptoms: leakage from plugs, noisy operation of the box. The solution is to drain the excess through the filler hole.

Do I need to flush the transmission when changing the oil?

Flushing is only necessary in three cases: 1) if the oil is black with metal shavings; 2) if the box was previously serviced unknown when; 3) if noise remains after replacement. In other cases, draining the waste is sufficient.

Is it possible to fill oil through the dipstick?

B Almera N16 The dipstick is not available in all modifications. If there is one, you can fill it through it, but it is more convenient to use the side filler hole (it is located above the oil level, which prevents overflow).