What are the signs that the automatic gearbox is low on oil?

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The most common signs that indicate that an automatic gearbox is low on oil are the difficulty to change gear, the increase in gearbox temperature, and a metallic noise coming from it. It is important to bear in mind that the lack of oil in an automatic gearbox can cause serious damage to the system and, therefore, it is necessary to revise and fill up the oil level regularly to prevent long-term problems in the automatic gearbox.