I'll second SlickGT1 repair. More than a year ago, I did mine. I have done about 15,000 kilometers since then, last July alone, we did about 6,500 km. As it was said, the gear gets worn only on about 30% of its circumference, so no need to replace it.

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John Caradimas
2005 X5 3.0lt diesel
Facelift, Sport packet