I followed the steps here:
BMW - The Infamous Alternator Bracket Oil Leak on the E65 BMW 7-Series - Pelican Parts Technical Article

it is very much a labor intensive job, and not for the faint of heart. You need all the tools, and a lift makes it much easier (I have a 2 post lift in my garage)

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2015 BMW X5 xdrive35i Msport
1999 Porsche Boxster
1974 Porsche 914 GT restomod