# Service bulletin M110708

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10147696
- Published by NHTSA: 2018\-11\-13
- Manufacturer's number: M110708
- Manufacturer's date: 2015\-03\-01
- NHTSA component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CRANKCASE \(PCV\)

## NHTSA's summary

Crankcase Ventilation System Diagnosis and Measurement. INFORMATION All current MINI engines incorporate a pressure\-controlled crankcase ventilation system. The crankcase ventilation systems use various different crankcase ventilation valves, depending on the engine type. Although the valves all look different, they function similarly, using a spring and diaphragm assembly to control the crankcase pressure. A properly functioning pressure control valve is designed to maintain a slight vacuum \(underpressure\) in the crankcase, which assures reliable crankcase venting during all engine operating conditions. Some of the causes and results of a malfunctioning crankcase ventilation system are listed below. Causes of Excessive Overpressure \(Pressure\) ? Internal engine damage/wear ? Obstruction in the crankcase ventilation system ? Defective pressure control valve Results of Excessive Overpressure ? Damage to the engine oil seals ? Increased engine oil consumption \(can be misdiagnosed as a defective turbocharger\) ? Excessive engine oil in the intake system ? Excessive engine oil in the charged intake tubes or the intercooler on turbocharged engines \(can be misdiagnosed as a defective turbocharger\) ? Engine oil dip stick is dislodged from the guide tube \(if equipped\) Cause of Excessive Underpressure \(Vacuum\) ? Defective pressure control valve Results of Excessive Underpressure ? Damage to the engine oil seals ? Increased engine oil consumption ? Excessive engine oil in the intake system ? Rough engine idling or engine misfire ? Whistling or howling noise from the engine \(can be misdiagnosed as a defective turbocharger\)

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2015/MC-10147696-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2015/MC-10147696-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Exhaust and emissions, Crankcase ventilation \(PCV\)

## Vehicles listed

- BMW BMW

JSON: [/v1/bulletins/10147696](/v1/bulletins/10147696)

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