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WHEN DOES AUTOMATIC NEED AN OIL CHANGE?

Many manufacturers advertise with the "maintenance-free automatic transmission" or the "lifetime transmission fluid". However, what is the actual need for an oil change in the automatic transmission?


An automatic transmission is subject to wear, oil aging and oil loss (venting). These points ultimately lead to disruptions and failures of the technology.


Clean and fresh oil and the correct oil level ensure reliable operation of the automatic transmission, but do not solve the design-related deficiencies.



HOW DO YOU RECOGNIZE THE NEED FOR OIL CHANGE?

The symptoms are initially inconspicuous: the gear change is delayed or jerky. The shift points of the transmission are therefore no longer correct. The deficits are particularly evident in cold temperatures.


There are several reasons for the problems: either the oil is aging or there is abrasion in the gearbox, which contaminates the oil. However, ATF oils age little because they are partially or fully synthetic.


Thus, the problems are more likely to be found in contaminants of the ATF oil, caused by abrasion of the gearbox. The abrasion consists of metal particles and coating particles of the so-called friction plates, which can damage the delicate control and thus the entire transmission, because the control piston jammed. An oil change can help here. What many car owners do not know: with most vehicles, only about 50% of the oil is replaced by an oil change. the remaining 50%, as well as the deposits remain in the vehicle. Only a so-called gearbox flushing exchanges 97% of the oil and serves at the same time for the preventive cleaning of the gearbox.


TIP: the Audi Multitronic transmissions have no torque converter and less abrasion than conventional automatic transmissions. For this reason i.d.R. a simple oil change.



WHEN DO YOU NEED A MAINTENANCE?


Cause   Damage Location   Remedy
Maintenance-related   peripherals, electrical   Query diagnosis
Vehicle-related   oil shortage   Correct oil level
Operational   overload   correct use
Operational   Oil aging or abrasion   Transmission flushing, oil change
Design Related   Individual transmission components   Repair of the automatic transmission


THE ATF OIL OF THE AUTOMATIC TRANSMISSION

ATF stands for "Automatic Transmission Fluid". ATF oils are particularly suitable for use in automatic transmissions.


Advantages of ATF oil


Very high temperature and aging stability, d. H. high protection against deposits or coking
Much better cold flow behavior
Higher efficiency
Reduced oil temperatures
In the automatic transmission, the ATF oil controls the following areas:
Power transmission in the converter
Control of the switching elements
Control of the friction values ​​at the switching elements
Heat dissipation, lubrication
ATF oils are ready for use in the temperature range from approx. -30 ° C to max. 400 ° C.  


ATF oils can not be used universally due to the special requirements for the friction characteristic of the gear types. The manufacturer's instructions must be strictly observed. Different types of ATF oils should never be mixed together because of the different friction behavior.


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