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Your MD dealer is just trying to get money out of you. There is no 12k mile differential change. The X5M has a 50k mile change but for the X5 those are lifetime fluids. If you are concerned about the coolant I would take it someplace else to have it checked.
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2021 BMW G20 M340i xDrive - Verde Ermes/Black - 03/2024.40
2019 BMW G05 X5 xDrive40i - Phytonic Blue/Cognac - 11/2023.50
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