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The essential oil change of the automatic gearbox

Even automatic gearboxes, without exception, must be regularly drained of their used oil. Otherwise, a breakdown is guaranteed. However, changing an automatic transmission is significantly more expensive than a manual transmission.

The complexity of changing automatic transmissions

The greatest difficulty linked to emptying automatic transmissions results in the complexity of the connections which, on certain vehicles, require several hours of dismantling. In 2010, only 9% of new vehicles were equipped with an automatic transmission. Now, 54% of new cars sold have it.

Comfort in the city and the illusion of a maintenance-free box

The automatic transmission provides real comfort in town, especially in traffic jams, but it is surprising to see such enthusiasm among rural people. This craze can be explained by a myth often conveyed by dealers: that of the maintenance-free gearbox. However, this statement is completely false and can be very expensive in repairs, because the cost of replacing an automatic transmission can be around €8,000.

The reasons behind the disappearance of manual transmissions

Manual gearboxes force manufacturers to develop complex transmission systems. By eliminating them, millions are saved in Research and Development. Motorists are sold the idea that they will no longer have to change the clutch or change the gearbox, even claiming that some gearboxes are lubricated “for life”. However, oil in automatic transmissions, just like in manual transmissions, wears out and becomes corrupted.

The importance of changing the oil on an automatic transmission

A gearbox has an estimated lifespan of 300,000 km, but this depends on its maintenance. A box is made up of pinions and gears which are bathed in transmission oil. This oil lubricates the parts while ensuring their proper functioning.

The dangers of used oil

Over time, transmission oil loses quality and efficiency. Residue and iron filings can mix with the oil, potentially damaging the sprockets to the point of breakage. To keep your automatic transmission in good condition, it is essential to drain it regularly.

the complexity of the operation

Changing gearbox oil is complex and should not be carried out by an amateur. In addition, the oil used must be approved by the gearbox manufacturer. The operation often requires the use of a special machine to suck up the used oil and inject the new oil at the correct temperature.

Signs of automatic transmission failure

Several signs could indicate a problem with your automatic transmission:

Warning signs

  • The box takes time to react from neutral to first.
  • Gears shift with difficulty or not at all.
  • You feel jerks when changing gears.
  • The vehicle appears to “slip” when starting.
  • There is a “burnt” smell.
  • A loss of power is noticeable when starting or accelerating.
  • You hear squeaks.
  • What type of oil for automatic transmission?

    Synthetic automatic transmission oils are rich in antioxidant, anti-wear and detergent additives, allowing them to remove filing particles. They are designed to withstand extreme temperatures and pressure.

    Characteristics of synthetic oils

    These oils are extremely fluid and are characterized by a blood red color. They maintain a consistent film despite repeated passages through the different gears, thus guaranteeing optimal lubrication of the gearbox components.

    When should you do an oil change?

    The oil change frequency depends on the type of automatic transmission. In general, an oil change is recommended every 60,000 km for boxes with dry clutch and every 45,000 to 60,000 km for aging boxes. A service every 8 years can also be a reference.

    Importance of following the maintenance log

    For other types of boxes, it is preferable to follow the recommendations in the manufacturer's maintenance booklet. Ignoring these recommendations can result in costly damage and a significant reduction in gearbox life.

    Can I do it myself and what is the cost?

    Changing an automatic transmission is a professional job. In addition to the required skills, a mechanic has the necessary equipment to carry out the operation correctly, in particular to suck up the used oil and inject the new oil.

    Cost of the operation

    The cost of oil changing depends on the model of your vehicle and the complexity of accessing the gearbox. The cost can vary from €247 to €700, a reasonable investment compared to the cost of replacing the box.

    Regularly draining the automatic transmission is essential to ensure the longevity and proper functioning of your vehicle. Neglecting this maintenance can lead to costly repairs and avoidable breakdowns.

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