Is this what you used?

Walmart.ca: Castrol, Castrol Dextron VI – 946ml, A premium synthetic transmission fluid for use in all GM vehicles. Certified and approved for by General Motors for all cars and trucks that call for DEXTRON –IV Also satisfies requirements

Thanks

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2006 BMW X5 (4.4i) N62

MY BMW X5... No matter how I disguise it... it's heritage keeps showing through!