# Service bulletin No. 91\-26

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: 11037847
- Published by NHTSA: 2026\-10\-02
- Manufacturer's number: No. 91\-26
- Manufacturer's date: 2026\-09\-24
- NHTSA component: POWER TRAIN; ENGINE

## NHTSA's summary

Technical Information for Particles/Metal Chips/Residues in Engine Oil

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037847-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037847-9999.pdf)

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

## Components

Engine, Transmission and driveline

## Vehicles listed

- 2020 to 2026 PORSCHE 911
- 2022 PORSCHE 911 4S
- 2020 to 2026 PORSCHE 911 CARRERA
- 2023 PORSCHE 911 CARRERA 4
- 2022 to 2023 PORSCHE 911 CARRERA 4 GTS
- 2023 PORSCHE 911 CARRERA 4S
- 2022 to 2024 PORSCHE 911 CARRERA GTS
- 2020 to 2021 PORSCHE 911 CARRERA S
- 2023 PORSCHE 911 CARRERA S
- 2023 to 2024 PORSCHE 911 CARRERA T
- 2023 to 2024 PORSCHE 911 DAKAR
- 2020 to 2021 PORSCHE 911 TARGA 4
- 2023 PORSCHE 911 TARGA 4
- 2023 PORSCHE 911 TARGA 4S
- 2023 PORSCHE 911 TARGA GTS
- 2020 to 2024 PORSCHE 911 TURBO
- 2021 to 2024 PORSCHE 911 TURBO S

## Recalls for the same vehicles and component

- [20V381000](/recalls/nhtsa/20V381000.md), 2020-07-01: POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT
- [2019291](/recalls/tc/2019291.md), 2019-06-12: Powertrain
- [19V445000](/recalls/nhtsa/19V445000.md), 2019-06-12: POWER TRAIN:AXLE HUBS; POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT

## Other bulletins for the same vehicles and component

- [WSM5](/bulletins/11037867.md), 2026-10-02, Service campaign: ENGINE; STRUCTURE:BODY. Porsche intranet posting for Campaign WSM5 – Replacing engine data sticker \(VECI\)
- [No. WSM5](/bulletins/11037865.md), 2026-10-02, Service campaign: ENGINE; STRUCTURE:BODY. Technical Information for Campaign WSM5 – Replacing engine data sticker \(VECI\)
- [SY No. 72\-26](/bulletins/11037832.md), 2026-10-02, Service bulletin: ENGINE; POWER TRAIN. Symptom\-based workshop manual for High\-Pitched “Whining” and Whistling Noises in Partial Load Operation from the Engine Area. Note that this bulletin only covers 911 Turbo S with the t\-hybrid system.
- [No. 72\-26](/bulletins/11037830.md), 2026-10-02, Service bulletin: ENGINE; POWER TRAIN. Symptom\-based workshop manual for High\-Pitched “Whining” and Whistling Noises in Partial Load Operation from the Engine Area. Note that this bulletin covers only 911 GTS t\-hybrid models.
- [No. 32\-26](/bulletins/11037826.md), 2026-10-02, Service bulletin: POWER TRAIN; ENGINE. Manufacturer's Certificate for Overview of approved Porsche C40 GT engine oils
- [No. 31\-26](/bulletins/11037825.md), 2026-10-02, Service bulletin: POWER TRAIN; ENGINE. Manufacturer's Certificate for Overview of Approved Porsche C40 Engine Oils
- [No. 30\-26](/bulletins/11037822.md), 2026-10-02, Service bulletin: ENGINE; POWER TRAIN. Manufacturer's Certificate for Overview of Approved Porsche C20 Engine Oils
- [No. 29\-26](/bulletins/11037818.md), 2026-10-02, Service bulletin: ENGINE; POWER TRAIN. Manufacturer's Certificate for Overview of Approved Porsche C30 Engine Oils
- [No. 28\-26](/bulletins/11037816.md), 2026-10-02, Service bulletin: POWER TRAIN; ENGINE. Manufacturer's Certificate for Overview of Approved Porsche C40 Engine Oils. Note that this bulletin covers all models back to model year 1984, for which C40 engine oils are allocated.
- [No. 27\-26](/bulletins/11037813.md), 2026-10-02, Service bulletin: POWER TRAIN; ENGINE. Manufacturer's Certificate for Overview of Approved Porsche C20 Engine Oils. Note that the bulletin covers all models back to model year 1984, for which C20 engine oils are allocated.

JSON: [/v1/bulletins/11037847](/v1/bulletins/11037847)

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