BMW 3 Series 2011–2013 — technical service bulletin
Bulletin SIB-11-14-14 · NHTSA communication 10057337 · issued Oct 1, 2014
Technical service bulletin
communication type
Engine
component
2011–2013
model years
12
vehicle entries
Official summary
Bmw: due to debris entering oil passage of engine, it will knock and lose power, during cylinder head mating surfaces and cleaning of engine block after repair to engine. *pe
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.