BMW X3, E83 GM 6L45 transmission. 2-3 shift hard Replaced transmission fluid and filter Then reset the adaptations Hard shifting goes away and transmission shift good. But after about 150km driving shifting issue 2-3 comes back. I suspected the fluid is the culprit. I used aftermarket fluid Dexron IV, but is not approved by BMW. Any idea? 24jw.

bmw x3 e83 oil capacity