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These forums have saved me thousands of dollars and I always look at multiple threads to get ideas. My new-to-me 2009 X5 4.8i (E70) developed a bad oil leak coming from behind the alternator. Almost every post identified the alternator bracket for models without an oil cooler. Mine HAS an oil cooler and I found it has a single E10 torx bolt that cannot be removed without a special set-up. There are two E10 torx bolts on the bottom of the oil cooler housing (And 1 E12 on the top) but the bolt in the rear position is obscured by the transfer case. E10 torx sockets in sets are always 3/8" drive. I found a 1/4" drive E10 socket from Wiha tools for $15. Using a 1/4' drive hinged Craftsman ratchet and a 2" extension, I was able to get right on that bolt. Only unscrew it until you can remove it by hand as the ratchet gets right on top of the transfer case pretty quickly. That's the trick to getting this job done, It's not easy but not rocket science either. You can do it!

Here's the link to that key set-up and the 1/4" E10 socket..
https://photos.google.com/photo/AF1QipNGR3JSxlZfDF2Pnod6An-WadF91yC2B9gmFlnB

 
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