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Service bulletins for the 1999 Porsche 911

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.

176 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. 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.
No. 33-202020-10-01. Service bulletin. ENGINE AND ENGINE COOLING. Overview of Approved Porsche C20 Engine Oils
No. 16-202020-06-01. Service bulletin. ENGINE AND ENGINE COOLING; EQUIPMENT. List of approved A40 engine oils for all applicable vehicles as of 1984.
122-M8J3B-052020-05-04. Service bulletin. ENGINE AND ENGINE COOLING. List of approved C40 engine oils for all Porsche models since 1984.
122-F4J4K-042020-04-02. Service bulletin. ENGINE AND ENGINE COOLING. List of approved engine oils for all Porsche models.
122-X2X7N-072019-07-08. Service bulletin. ENGINE AND ENGINE COOLING. Notice to dealers that coolants will be moved out of the special tool cabinet in the dealer service department in order to make room for new special tools. All coolant tools will be moved to the "Coolant Cart" because they need to be housed in the same place.
1010052005-12-16. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. HANDLING PTFE CRANKSHAFT SEALS. 8JB
13592005-12-14. Service bulletin. ENGINE AND ENGINE COOLING. INSTALLING PTFE (POLYTETRAFLUOROETHYLENE) CRANKSHAFT SEALS ON REPLACEMENT ENGINES. *TT
4052005-11-10. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. NEW CRANKSHAFT SEALING RING ON FLYWHEEL SIDE. *TT
3002004-07-21. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE OIL LEAKS IN AREA OF CRANKSHAFT SEALING RING IN FLYWHEEL SIDE MAY BE COMING FROM THE CRANKCASE AND INTERMEDIATE-SHAFT FLANGE BOLTS. *MJ
11A012003-10-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. CRANKCASES AND BEARING HOUSING USE FOR REPAIRS/REPLACEMENT PARTS. *TT
26012003-06-26. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. EXHAUST SYSTEM/SPORTS EXHAUST SYSTEM. *TT
4022003-05-07. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. ENGINE OILS APPROVED BY PORSCHE. *TT
8022003-02-10. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. DUAL MASS FLYWHEEL CHECK PROCEDURE. *TT
8022003-02-10. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE. DUAL MASS FLYWHEEL CHECK PROCEDURE. *TT
3022002-07-15. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE. DRIVE PLATE TIGHTENING TORQUE. *TT
26342000-04-11. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE. INSTALLATION OF CHROME PLATED TAILPIPES.

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