It's fine. I was adding the Pentosin to mine. I added it for a while when I first bought the X5. It's pricey for such a small bottle. After a few months, I discovered it uses ATF. A new filtered reservoir was installed. It was installed to fix a notorious leak. It ruined the OEM alternator. Hoses were old and brittle. New hoses and reservoir fixed it. No issues on mine since going back to ATF DEX VI.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)