I would get new chain tensioners ASAP because nobody changes then before they show signs of failure and by then usually too late.

Fortunately it's probably not nearly high risk as the M62 motor but I've seen on xo what happens in the N62 when the chain guides fail and it's not pretty, the chain acts like a chain saw and starts working it's way though the timing department.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)