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Not intimate with the 2 series auto trans but to give you some insight.
O-ring occasional failure on a new car is rare but on older cars more common.
My mercedes automatic held slightly over 9.1 liters of fluid - they actually use transmission fluid as a coupling device to transmit power. So one liter of fluid is not near the minimum.
That's why cars go in for service to look for these types of minor issues.
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