I understood the timing chain thing was for the N20, not the N54 or 55.
We have a 2013 X1 with the N20 (S28i X Line) and our local indy tells us that it's actually not all that common and to just keep an eye on the tensioner for funny noises etc and be happy.
135,000 miles and it's all quiet and happy in there with regular maintenance.
My 135 is perfectly happy, no timing chain issues there with ~125K miles.
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1and1
135i - E82.N54 2009 BSM - MHD / xHP / DCI, PR CP & 7.5" Race IC / N55 mid & Borla
. . WL RSFI, Koni, Eibach & Dinan CP's, M3 CA's / EBC Red's & Firehawk 500's
X1 - E84.N20 2013 MGM - JB4 - The Wife's, now with new turbo & ewg
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