Service bulletin No. 28-20
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 | 10177930 |
| Published by NHTSA | 2020-08-05 |
| Manufacturer's number | No. 28-20 |
| Manufacturer's date | 2020-07-10 |
| NHTSA component | ENGINE AND ENGINE COOLING |
NHTSA's summary
List of approved A40 engine oil for classic Porsche vehicles.
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Engine
| PORSCHE 911 | 1984 |
|---|---|
| PORSCHE 928 | 1984 |
| PORSCHE 944 | 1984 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| No. 19-23 | 2023-10-05. Service bulletin. Manufacturers certificate for an overview of approved Porsche A40 engine oils. |
|---|---|
| No. 18-23 | 2023-10-05. Service bulletin. Manufacturers certificate for an overview of approved Porsche C40 engine oils. |
| No. 17-23 | 2023-10-05. Service bulletin. Manufacturers certificate for an overview of approved Porsche C30 engine oils. |
| No. 16-23 | 2023-10-05. Service bulletin. Manufacturers certificate for an overview of approved Porsche C20 engine oils. |
| No. 14-23 | 2023-08-04. Service bulletin. Manufacturers certificate for allocation of approved engine oils |
| No. 02-23-1 | 2023-04-06. Service bulletin. Manufacturers certificate for approved engine C20 engine oils. |
| No. 05-23 | 2023-03-04. Service bulletin. Overview of approved engine A40 oils for all Porsche models that use A40 oil. |
| No. 04-23 | 2023-03-04. Service bulletin. Overview of approved engine C40 oils for all Porsche models that use C40 oil. |
| No. 03-23 | 2023-03-04. Service bulletin. Overview of approved engine C30 oils for all Porsche models that use C30 oil. |
| No. 33-22 | 2022-08-05. Service bulletin. Overview of approved engine C20 engine oils for all Porsche models using this oil. |