You need to drain the CVT fluid and refill like this using a VAS 5162 which is £114 plus VAT from a TPS.
Unscrew ATF drain plug -A- with multi-point bit -3357- and drain off ATF.
Re-tighten ATF drain plug, tightening torque: 24 Nm.
Unscrew ATF inspection plug –B.
Fill gearbox with at least 4.5 to 5 litres of fresh CVT ATF using the VAS 5162.
Move selector lever to position “P”, start engine and allow to run at idling speed.
Vehicles from model year 2005 onwards: Selector lever in position “P”. Press
accelerator pedal to briefly rev engine up to at least 2,500 rpm.
The ATF temperature at the beginning of the test must not be higher than 30°C. If necessary, first allow the gearbox to cool down.
Using a diagnostic system, select Auto Trans 03, Measuring Blocks 08, Display group 10, ATF temp is shown in Zone 3.
When the ATF has reached a temperature of 35°C, unscrew ATF inspection plug -B-.
When the plug is opened, approx. 5 cl of ATF will always run out of the inner oil level tube
If ATF continues to come out through ATF inspection opening via overflow pipe
before ATF has reached a temperature of 40 °C, the ATF level is OK.
Renew ATF inspection plug and tighten. Tightening torque: 20 Nm.
ATF inspection plug must be screwed in again at the latest when ATF reaches temperature of 45 °C (countries with hot climates: 50 °C).
If ATF temperature exceeds 45 C, too much fluid will escape as it expands when heated. In this case the quantity of fluid in the gearbox is NOT sufficient!
The ATF check is now completed.