So glad I didn't fix my leaky seals by myself. And I'm even more glad that my extended warranty covered the repair. IIRC, the valve stem repair was billed to the warranty at about $4000.

The car was in the shop for over a week. Partly because they did additional repairs and partly because the valve stem seal job is so tedious that the technician could only do a little bit at a time. They also used the AGA tool kit.

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2006 X5 4.4i
Sport package, summer package, cold weather package, DSP + Nav
Bought 2/14 with 73k miles