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Service bulletins for the 1994 Porsche 928

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.

83 on file from NHTSA, as of 2026-10-19.

By type

By component

Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
No. 19-232023-10-05. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION. Manufacturers certificate for an overview of approved Porsche A40 engine oils.
No. 18-232023-10-05. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION. Manufacturers certificate for an overview of approved Porsche C40 engine oils.
No. 17-232023-10-05. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION. Manufacturers certificate for an overview of approved Porsche C30 engine oils.
No. 16-232023-10-05. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION. Manufacturers certificate for an overview of approved Porsche C20 engine oils.
No. D6472023-09-09. Service bulletin. UNKNOWN OR OTHER; ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION:PUMP. Parts information on parts withdrawal for the oil pump
No. 14-232023-08-04. Service bulletin. ENGINE AND ENGINE COOLING. Manufacturers certificate for allocation of approved engine oils
No. 02-23-12023-04-06. Service bulletin. ENGINE AND ENGINE COOLING. Manufacturers certificate for approved engine C20 engine oils.
No. 05-232023-03-04. Service bulletin. ENGINE AND ENGINE COOLING. Overview of approved engine A40 oils for all Porsche models that use A40 oil.
No. 04-232023-03-04. Service bulletin. ENGINE AND ENGINE COOLING. Overview of approved engine C40 oils for all Porsche models that use C40 oil.
No. 03-232023-03-04. Service bulletin. ENGINE AND ENGINE COOLING. Overview of approved engine C30 oils for all Porsche models that use C30 oil.
No. 33-222022-08-05. Service bulletin. ENGINE AND ENGINE COOLING. Overview of approved engine C20 engine oils for all Porsche models using this oil.
No. 31-222022-08-05. Service bulletin. ENGINE AND ENGINE COOLING. Overview of approved engine C40 engine oils for all Porsche models using this oil.
No. 36-222022-08-05. Service bulletin. ENGINE AND ENGINE COOLING. Instructions on the manufacturers certificate for approve Porsche A40 engine oils.
No. 35-222022-08-05. Service bulletin. ENGINE AND ENGINE COOLING. Overview of approved engine C30 oils for Porsche models using C30 oils.
No. 59-212021-09-03. Service bulletin. ENGINE AND ENGINE COOLING. List of approved C20 engine oils for all Porsche models using C20 oil.
No. 60-212021-09-03. Service bulletin. ENGINE AND ENGINE COOLING. List of approved engine C30 engine oils for all Porsche vehicles using C30 oil.
No. 61-212021-09-03. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. List of approved engine oils for all Porsche models using C40 oil.
No. 13-212021-04-05. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. List of approved C20 style engine oils for classic and new Porsche models since 1984.
No. 09-212021-04-02. Service bulletin. ENGINE AND ENGINE COOLING. List of approved A40 style engine oils for new and classic Porsche vehicles MY 1984 and newer.
No. 08-212021-04-02. Service bulletin. ENGINE AND ENGINE COOLING. List of approved C40 engine oils for new and classic Porsche vehicles MY 1984 and newer.
No. 07-21-12021-04-02. Service bulletin. ENGINE AND ENGINE COOLING. List of approved C30 engine oils for all new and Classic Porsche vehicles MY1984 and newer.
No. 03-212021-04-02. Service bulletin. ENGINE AND ENGINE COOLING. List of approved C20 engine oils for all new and classic Porsche models 1984 and newer.
No. 54-202021-01-05. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. List of approved A40 style engine oils for new and classic Porsche models.
No. 53-202021-01-05. Service bulletin. ENGINE AND ENGINE COOLING. List of approved C40 style engine oils for new and classic Porsche vehicles.
No. 20002020-11-06. Service bulletin. ENGINE AND ENGINE COOLING. Advanced Technical information on a NVH Lubrication kit.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.