Tensioner is a ten minute job with the right tools. It's tricky to get the right socket to fit: the AC compressor is in the way so a deep socket won't fit and a shallow won't grab the tensioner. A medium depth 19mm with the right extension works or a though socket with extension also works.
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2011 E70 • N55 (me)
2012 E70 • N63 (wife)
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