If I were you, I would focus on verifying that the transmission oil is at the correct level as per instructions. Follow the instructions and do not cut corners. Vehicle/transmission needs to be level (I'd use a magnetic leveler on the transmission itself). After validating the level is correct (not under filled or over filled) at the specified temp, I'd then research further.

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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.