# Service bulletin SIB330321

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: 10204624
- Published by NHTSA: 2021\-12\-13
- Manufacturer's number: SIB330321
- Manufacturer's date: 2021\-07\-01
- NHTSA component: POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT

## NHTSA's summary

During the vehicle's operational life, normal gear oil seepage or sweating, in addition to accumulated road dust, dirt and grime under the vehicle can give an appearance that there is an active rear differential oil leak. This is further exaggerated by residual oil that remains on the rear differential cover after maintenance services are performed. If this visual appearance of accumulated oil on the rear differential is misinterpreted as an active engine oil leak, then unnecessary seal/gasket repairs/replacements will result.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10204624-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10204624-9999.pdf)

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

## Components

Transmission and driveline, Differential

## Vehicles listed

- BMW BMW

JSON: [/v1/bulletins/10204624](/v1/bulletins/10204624)

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