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Service bulletin 99086

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 id6089931
Published by NHTSA2000-02-29
Manufacturer's number99086
Manufacturer's date1999-12-01
NHTSA componentENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

EXHIBITING A CONDITION IN WHICH THE CYLINDER HEAD BOLTS MAY BECOME LOOSE AND CAUSE COOLANT LEAKS AND POSSIBLE ENGINE DAMAGE. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Vehicles listed
CADILLAC DEVILLE1999
CADILLAC ELDORADO1999
CADILLAC SEVILLE1999
OLDSMOBILE AURORA1999

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

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