In all cars, oil is used to lubricate and cool the gearbox components. Therefore, timely replacement of oil and regular gearbox maintenance are very effective in improving driving conditions and ensuring proper vehicle performance. Inside gearboxes, a special oil called transmission oil (Vaseline oil) is used. Considering the internal parts of the gearbox and the use of gears and bearings, the oil inside the gearbox gradually becomes worn and dirty. To prevent this, a gearbox filter is placed in the oil flow path to improve performance and efficiency.

What is a Gearbox Filter in a Car?

As mentioned, oils are used inside the car’s gearbox to both lubricate and cool the components. However, sometimes gearbox parts suffer minor wear during operation. This causes fine metallic and sometimes non-metallic particles to circulate and penetrate into the oil. These particles may not be visible to the naked eye, but they can cause serious problems such as intensifying wear and contaminating the gearbox oil. For this reason, an oil filter is used in the gearbox system, acting like a strainer between the oil and the gearbox.

The main role of this filter is to separate fine particles from the gearbox oil. If this process is not done correctly, it can cause irreparable damage. This component also prevents gearbox oil contamination. Over time, the gearbox oil filter gets dirty, disrupting the vehicle’s performance. Therefore, it must be replaced after a period of use.

Advantages of a Gearbox Oil Filter

The presence of an oil filter in the engine increases oil efficiency, extends engine life, and ensures proper vehicle performance. Filtration also helps reduce oil wear, corrosion, and damage. During driving, pollutants can enter the engine; a proper filter traps these impurities no matter how small they are.

Signs of a Faulty Gearbox Oil Filter

If this part is not replaced on time, it loses its efficiency. A failing gearbox oil filter shows several signs, such as clogging, gearbox component wear, changes in oil color (no longer clear but turning brown), and the appearance of metal shavings in the gearbox system.

• Filter blockage
• Wear and tear of gearbox components
• Oil discoloration, losing its clarity and turning dark
• Presence of metal shavings in gearbox parts

Which Cars Have Gearbox Filters?

Currently, most vehicles with automatic transmissions—such as Peugeot 207 automatic, Mercedes-Benz, BMW, Prius, Tara automatic, and others—are equipped with gearbox oil filters.

For some of these vehicles, the filter is located in the oil pan, while in others it is inside the gearbox. This difference affects the filter replacement process. For example, in cars like Mercedes, BMW, and certain Japanese models with hydraulic gearboxes, the filter is inside the oil pan, requiring specialized technicians for replacement.

When Should a Gearbox Filter Be Replaced?

The gearbox oil filter needs replacement after a certain mileage specified by the manufacturer. It is recommended to replace the filter whenever the gearbox oil is changed. This job should be carried out by skilled mechanics at auto service centers since it is a complex and delicate process.

Typically, a gearbox oil filter should be replaced every 20,000 kilometers, though this can vary depending on vehicle usage. Failure to replace it can put pressure on other components and disrupt their function. If ignored, the clogged filter will pass less oil, potentially causing gearbox overheating and failure.

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