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That's not completely out of the ordinary for a 135i. Just to be sure, I would check for leaks though, valve cover, oil filter housing, and oil pan gaskets are all common areas for leaks to develop, and even a slow leak could lose half a quart in a year and a half...
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2011 BMW 135i ///M-Sport, DCT
Bilstein B12 kit, Dinan camber plates, M3 front control arms, Whiteline poly RSFB, MHD Stage 1, cp-e Charge Pipe, H&R Front sway bar, BMW performance diffuser
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