JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

Wähle ein anderes Land oder eine andere Region, um Inhalte für deinen Standort zu sehen. Select another country or region to see content for your location. Seleccione otro país o región para ver el contenido de su ubicación. Selecteer een ander land of een andere regio om de inhoud van uw locatie te zien. Vælg et andet land eller område for at se indhold, der er specifikt for din placering. Voit katsoa paikallista sisältöä valitsemalla jonkin toisen maan tai alueen. Choisissez un pays ou une région pour afficher le contenu spécifique à votre emplacement géographique. Επίλεξε μια άλλη χώρα ή περιοχή, για να δεις περιεχόμενο σχετικό με την. Scegli il Paese o territorio in cui sei per vedere i contenuti locali. 別の国または地域を選択して、あなたの場所のコンテンツを表示してください。 Velg et annet land eller region for å se innhold som gjelder der. Escolha para ver conteúdos específicos noutro país ou região. Välj ett annat land eller område för att se det innehåll som finns där. Konumunuza özel içerikleri görmek yapmak için başka bir ülkeyi veya bölgeyi seçin. Chọn quốc gia hoặc khu vực khác để xem nội dung cho địa điểm của bạn

05/30/2025
2min

Changing the Transmission Oil in Automatic and Dual-Clutch Transmissions

#Car

#Workshop

For optimum shifting performance and a long service life: How to change the oil in automatic and dual-clutch transmissions correctly.

A professional transmission oil change in modern automatic and dual-clutch transmissions requires high expertise, the right equipment, and a systematic approach. Optimal function and longevity of the transmission can only be ensured if all steps are carried out carefully. To ensure an efficient and professional oil change, we recommend observing the following steps:

1. Check the Service History

Before starting the oil change, the vehicle's service history should be reviewed. It is important to check when the last transmission oil change was performed and whether the change intervals specified by the manufacturer were observed.

2. Test Drive the vehicle together with the Customer

Performing a test drive before starting work, ideally alongside with the vehicle owner, is recommended. This is the only way to identify and document any abnormalities in shifting behavior or transmission function in advance.

3. Additional diagnostic steps in cases of unclear service history or abnormalities

If there is no complete service history or the vehicle has a high mileage or noticeable transmission problems, additional diagnostic steps should be performed:

Reading the error log to check for OBD II codes.
If codes are present, additional diagnosis may be needed.
Taking a used oil sample to assess fluid condition

4. Performing the oil change according to the manufacturer's specifications

The actual oil change must always be carried out according to the vehicle manufacturer's specifications. We recommend using appropriate flush equipment such as the LIQUI MOLY Gear Tronic.

A professional process includes the following steps:

Cleaning the transmission system with our Pro-Line Automatic Transmission Cleaner
Draining and flushing the entire oil circuit
Changing the transmission oil filter
Filling with fresh transmission oil. Use the LIQUI MOLY oil guide to find the correct transmission fluid.
Checking the fill level with a suitable diagnostic tool at the specified oil temperature.
Final test drive.

You can find more information about our automatic transmission fluid service unit Gear Tronic III and the associated concepts here.

Contact Liqui Moly's technical support to answer any questions.

Phone: +49 731 1420-871 (international)

Email: support@liqui-moly.de