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Service bulletin No. 3-20

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10180465
Published by NHTSA2020-10-01
Manufacturer's numberNo. 3-20
Manufacturer's date2020-09-08
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

Information on Classic 993 generation 911 crankcases.

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

Vehicles listed
PORSCHE 9111996, 1997, 1998

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
95V2480001995-12-28. ENGINE AND ENGINE COOLING:COOLING SYSTEM
95V2470001995-12-28. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
PIWIS2401e2024-02-08. Service bulletin. Information on PIWIS tester update 42.500.005
No. 19-232023-10-05. Service bulletin. Manufacturers certificate for an overview of approved Porsche A40 engine oils.
No. 18-232023-10-05. Service bulletin. Manufacturers certificate for an overview of approved Porsche C40 engine oils.
No. 17-232023-10-05. Service bulletin. Manufacturers certificate for an overview of approved Porsche C30 engine oils.
No. 16-232023-10-05. Service bulletin. Manufacturers certificate for an overview of approved Porsche C20 engine oils.
No. D6472023-09-09. Service bulletin. Parts information on parts withdrawal for the oil pump
No. 14-232023-08-04. Service bulletin. Manufacturers certificate for allocation of approved engine oils
No. 02-23-12023-04-06. Service bulletin. Manufacturers certificate for approved engine C20 engine oils.
No. 05-232023-03-04. Service bulletin. Overview of approved engine A40 oils for all Porsche models that use A40 oil.
No. 04-232023-03-04. Service bulletin. Overview of approved engine C40 oils for all Porsche models that use C40 oil.