An automatic transmission is one of the most complex and expensive units in a modern car. Nissan Almera G15. Many owners mistakenly believe that transmission fluid is filled for life and does not require maintenance, but this is a myth that can cost you tens of thousands of rubles.
The fine oil filter installed inside the valve body becomes clogged with friction wear products and metal shavings over time. If the replacement is not carried out in time, this will lead to a decrease in oil pressure, slipping of the clutch packs and, ultimately, to a major overhaul of the unit. Regularly changing the filter and oil is the key to the long life of your box.
The replacement procedure for the G15 model has its own characteristics that differ from previous generations. You will be faced with the need to remove the pallet, which requires accuracy and the availability of specific tools. It is important to understand that this car uses a continuously variable transmission (CVT) or a classic automatic depending on the configuration, and each type has its own nuances, but in the context of the G15 we are most often talking about a Jatco CVT, where filtration is critical.
Why the automatic transmission filter cannot be ignored
The main task of the filter is to catch the smallest particles formed during the operation of the transmission. Over time, a clogged filter stops passing enough fluid, creating a vacuum at the inlet of the oil pump. This phenomenon is called cavitation, and it is extremely destructive to internal components.
When oil flow is restricted, the torque converter and friction discs do not receive the necessary cooling and lubrication. You may notice that the car begins to jerk when changing gears or there are delays when starting off. These symptoms are often attributed to the need for adaptation, but the root of the problem lies precisely in the lubrication system.
It is important to understand the difference between a coarse and fine filter. On Nissan Almera G15 usually uses a coarse mesh filter, which is easy to wash, but some modifications also have a fine paper filter, which can only be replaced. Ignoring the condition of the grid will cause large particles to get into the solenoids and clog them.
Timely replacement allows you to maintain the pressure in the line at the normal level. If you operate a car in a city with frequent traffic jams, the oil and filter change interval should be reduced to 40-50 thousand kilometers, since overheating of the oil accelerates its degradation.
Required tools and spare parts
Before starting work, you need to prepare everything you need so as not to be distracted during the process. You will need a set of wrenches and sockets, including an extension and a ratchet to access the pan bolts. Also, do not forget to prepare a container to drain the waste liquid, which has an unpleasant odor and color.
The most important element is the new filter. For the G15 model with a Jatco CVT, a filter mesh is often used, which is attached to the oil pump. However, depending on the year of manufacture and the specific revision of the unit, a replacement cartridge may be required. Always check the part number against your vehicle's VIN.
- 🔧 New filter (original or high-quality analogue)
- 🛢️ Original CVT Fluid NS-3 (volume about 4-5 liters for partial replacement)
- 🧼 Sealant for pallet (liquid, heat-resistant, gray or black)
- 🧽 Rags and carburetor cleaner for washing parts
Don't forget about the pan gasket. In most cases, the original gasket can be reused if it is not damaged, but to be safe, it is better to immediately buy a new one. Also prepare the magnets that are inside the tray - they need to be cleaned of metal shavings.
The tools you will need are: a head for 10 and 12, a knob, a container for draining, a funnel and a syringe for filling in oil. If you don't have a syringe, you can use a special funnel attachment, but this is less convenient. A flashlight will also come in handy, as it will be dark under the car.
⚠️ Attention: Use liquid only CVT Fluid NS-3. The use of other types of fluids, even with similar characteristics, can lead to irreversible destruction of the variator clutches and void the warranty.
Step-by-step instructions for replacing the filter
The process begins with preparing the car. Install Nissan Almera G15 on level ground or a lift. Stop the engine and allow it to cool slightly so that the oil is not boiling but still liquid enough to drain. Open the hood and unscrew the filler cap to allow air to enter.
Raise the vehicle and place it on stands for safety. Find the drain plug on the transmission pan, unscrew it and drain the old oil into a prepared container. After the oil stops flowing, you can begin to unscrew the pan mounting bolts. Do this gradually, starting from the edges, so that the tray does not sag.
☑️ Preparing to replace the filter
Carefully remove the pan by prying it with a screwdriver in places where the sealant may have stuck. Be careful not to damage the surface of the tray. Inside you will see a filter that is bolted to the oil pump. Unscrew these bolts and carefully remove the filter, being careful not to spill any remaining oil.
Now you need to thoroughly clean the filter seat and the oil pump itself from dirt and deposits. Use carburetor cleaner and a rag. Install the new filter, tighten the mounting bolts to the recommended torque. Do not overtighten them to avoid stripping the threads in the pump housing.
How to properly clean magnets
Magnets located on the tray collect metal shavings. They must be thoroughly washed in solvent or gasoline using a brush. If there are too many chips, this is a signal of serious wear on the unit.
Before installing the pan, apply a thin layer of sealant to the edge of the pan. Apply sealant in a continuous line, avoiding interruptions. Reinstall the pan and tighten the bolts in a crisscross pattern. This will ensure an even fit and prevent leaks. Wait for the sealant to dry according to the instructions on the tube.
Pour new oil through the filler neck under the hood. Use a syringe or funnel. Fill in approximately 3-4 liters. Then start the engine, engage all gears in turn, holding each gear for a few seconds. This is necessary to bleed the system and fill the torque converter.
Checking the oil level and adapting
After you have started the engine and revved up the gas, you need to check the oil level. Many Nissan models have a test bolt or dipstick for this purpose, but the G15 often uses the drain hole method while the engine is running. This is a delicate point that requires precision.
Make sure the engine is warmed up to operating temperature (usually 40-60 degrees). With the engine running, unscrew the level plug (if there is one) or check the level through the dipstick. Oil should drip slightly from the hole. If there is not enough oil, add it to the required level.
- 🔍 Check for leaks at the installation site of the pallet
- 🚗 Test the operation of the box in quiet mode
- ⚙️ Make sure there are no jerks or kicks when switching
The ECU can remember the wear parameters of old clutches. When driving quietly, the computer will quickly reconfigure, but to speed up the process, you can use a diagnostic scanner to reset the adaptations.
⚠️ Attention: Do not exceed the speed of more than 60 km/h in the first 500 kilometers after replacement. This is necessary for careful grinding in of new seals and stabilization of pressure in the valve body.
- Classic slot machine
- CVT (CVT)
- Robot
- I don't know
Frequent maintenance errors
One of the biggest mistakes is using the wrong sealant. Regular silicone does not withstand the temperature conditions of the transmission and can dissolve in the oil, clogging the channels. Use only specialized heat-resistant compounds recommended by the manufacturer.
Another mistake is trying to wash the filter. If you have a fine paper filter installed, it cannot be washed. It is porous, and water or solvent can damage the structure, allowing dirt to pass through. Only coarse metal mesh can be washed.
Don't skimp on oil. Cheap analogues often have the wrong viscosity and additive package, which leads to rapid wear of the clutches. Original liquid CVT Fluid NS-3 designed specifically for Jatco CVTs installed on Nissan Almera.
Ignoring the condition of the magnets is also a mistake. If large metal shavings or “foil” (clutch layers) are found on the magnets, this is a sign of serious failure. In this case, simply replacing the filter will not help, and diagnostics will be required.
Cost and timing of work
If you decide to make the replacement yourself, the cost will consist only of the price of spare parts and oil. The original filter is inexpensive, and the oil will require about 4-5 liters. In general, the savings compared to a service station will be significant.
At specialized services, the work of replacing the filter and oil is more expensive due to labor costs. The technician will need time to lift the car, drain it, disassemble and reassemble. Usually it takes 1.5-2 hours. However, professionals use lifts and have experience working with sealants.
| Name | Approximate price (RUB) | Note |
|---|---|---|
| Automatic transmission filter (original) | 1500 - 2500 | Depends on type (mesh or cartridge) |
| CVT oil NS-3 (1 liter) | 800 - 1200 | Requires 4-5 liters |
| Pan gasket | 300 - 600 | It is recommended to change |
| Service station work | 2000 - 3500 | Includes draining, replacement and inspection |
The choice between replacing it yourself and contacting a service depends on your skills and the availability of the tool. If you've never worked on a car, it's best to leave it to the professionals to avoid leaks or damage to the pan.
Symptoms of a faulty filter
How can you tell if the filter is clogged? The first sign is the noise of the oil pump, which can be heard in the form of a hum or whistle. There may also be a decrease in pressure, which manifests itself in difficult gear shifting.
If the filter is heavily clogged, the box may go into emergency mode. In this case, the car will drive in only one gear, and the transmission fault icon will light up on the dashboard. In this case, replacing the filter is mandatory, but diagnostics of the valve body may also be required.
Regularly checking your oil level and condition is the best way to prevent problems. If the oil is dark, has a burning smell, or has visible particles in it, it's time to change the filter and oil. Don't wait for severe symptoms to appear.
Timely maintenance extends the life of the variator by tens of thousands of kilometers. Ignoring the manufacturer's recommendations for replacing filters and fluids is a direct path to expensive repairs. Remember that prevention is always cheaper than repairs.
Replacing an automatic transmission filter on a Nissan Almera G15 is a mandatory procedure that should be carried out every 40-50 thousand kilometers to prevent CVT breakdowns.
What volume of oil is needed to completely replace the filter on a Nissan Almera G15?
To completely replace the system, about 7-8 liters of oil are required, but when replacing the filter with partial draining of the pan, 4-5 liters are enough. It is recommended to do several oil changes to achieve cleanliness.
Can I use a filter from other Nissan models?
No, the filter must be suitable in size and type of fastening. Use only original spare parts or high-quality analogues, verified by the VIN code of your car. The wrong filter may not provide the desired filtration.
How often do you need to change the filter on a variator?
The recommended filter replacement interval is 40-50 thousand kilometers. If you operate the car in difficult conditions (traffic jams, towing), the interval should be reduced to 30 thousand kilometers.
What to do if jerking occurs after changing the oil?
This may be due to the adaptation of the box. Try driving 100-200 kilometers in a quiet mode. If the jerking does not disappear, the filter may be installed incorrectly or there is a problem with the valve body that requires diagnosis.
Do I need to warm up the box before checking the oil level?
Yes, the oil must be heated to operating temperature (40-60 degrees). Cold oil has a different density and the level will be incorrect. The check should be carried out with the engine running.