"N20 engine oil feed line to the turbocharger: limited warranty extension to 10 years/120,000 miles.
BMW technical service bulletin B111116 for 2012-2013 BMW 328I, 2013 BMW X3 and 2012-2013 BMW Z4 and others.
- Bulletin number
- B111116
- Component
- Engine and engine cooling
- Summary
- "N20 ENGINE OIL FEED LINE TO THE TURBOCHARGER: LIMITED WARRANTY EXTENSION TO 10 YEARS/120,000 MILES. When starting a cold engine, a ""plume of blue smoke"" can be seen emitting from the exhaust tailpipe for approximately 10-20 seconds. There is no engine malfunction light illuminated (no"" turbocharger boost faults are stored) and no drivability issues are detected. When the vehicle is parked overnight the engine oil pressure will equalize, this may cause engine oil to leak past the turbocharger ""exhaust side"" turbine seal."
Owners of these vehicles have filed 464 complaints in the engine category.
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