Checking the oil level in automatic gearboxes
63Regular checking of the oil is a vital activity that is essential for trouble-free functioning of an automatic gearbox. Unfortunately, a lot of people forget about it altogether. Judging the oil temperature in an automatic gearbox can be somewhat problematic. Still, it is hugely relevant while checking its' level.
Deficiency of oil
That is why we normally assumer it reaches the right temperature after driving over 20kms, or simply after 20 minutes of city driving. After that you should leave the engine working for 3-5 minutes with the car remaining stationary on a level ground (position N). At this point the oil level on the measure should be in-between Min and Max. If the oil temperature is particularly high, the allowed level should not exceed 5mm above Max. When refilling gearbox oil you should add it gradually (100ml at a time) and remember to check the level several times. Bear in mind that it is not uncommon to misinterpret the indications on the measure, as well as overfill with oil, since the difference between Min and Max can be as little as 200ml (especially in the older types of gearboxes). That is why after refilling the oil you should always check the level at least two or three times.
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Deficiency of oil often leads to quick gearbox devastation, with a large variety of different damages that can result from it. Also, even though a lot of people believe that an excess of oil is not harmful, it is exactly the opposite. The amount of oil is always calculated in relation to the pumps ability to distribute the oil to wherever it is needed in any given conditions. But with excess oil the pressure rises, which can result in damages to gearbox sealing, or other delicate elements, which automatic gearboxes are full of.
Repair of automatic gearbox is usually rather expensive. It depends on the type of gearbox and the damage it suffered from. With cars that are fifteen years or older it is often uneconomic, since the cost of repair exceeds the total value of the car.
