# Service bulletin No. 91\-24

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: 11017840
- Published by NHTSA: 2025\-05\-05
- Manufacturer's number: No. 91\-24
- Manufacturer's date: 2025\-04\-07
- NHTSA component: ENGINE

## NHTSA's summary

Technical information for Oil Leakage in the Area of the Upper Part of the Oil Pan and Crankcase: Checking Return Seal on Upper Part of Oil Pan and Replacing if necessary

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11017840-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11017840-9999.pdf)

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

## Components

Engine

## Vehicles listed

- 2020 to 2024 PORSCHE 911
- 2022 PORSCHE 911 4S
- 2020 to 2024 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
- 2021 to 2024 PORSCHE 911 GT3
- 2023 to 2024 PORSCHE 911 GT3 RS
- 2022 to 2023 PORSCHE 911 GT3 TOURING
- 2020 to 2021 PORSCHE 911 TARGA 4
- 2023 PORSCHE 911 TARGA 4
- 2023 PORSCHE 911 TARGA 4S
- 2023 PORSCHE 911 TARGA GTS
- 2020 to 2023 PORSCHE 911 TURBO
- 2021 to 2023 PORSCHE 911 TURBO S

## 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 \(VECI\)
- [No. 91\-26](/bulletins/11037847.md), 2026-10-02, Service bulletin: POWER TRAIN; ENGINE. Technical Information for Particles/Metal Chips/Residues in Engine Oil
- [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.
- [No. 26\-26](/bulletins/11037812.md), 2026-10-02, Service bulletin: ENGINE; POWER TRAIN. Manufacturer's Certificate for Overview of Approved Porsche C30 Engine Oils. Note that the bulletin includes all models back to model year 1984, for which C30 engine oils are allocated.

JSON: [/v1/bulletins/11017840](/v1/bulletins/11017840)

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