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Service bulletin 99WS001

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 id610470
Published by NHTSA2000-05-02
Manufacturer's number99WS001
Manufacturer's date1999-10-22
NHTSA componentENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

A CONDITION MAY EXIST WHERE THE DIPSTICK FOR THE 48FX WITH CUMMINS ISM/M11 ENGINE IS DIFFICULT TO ACCESS. *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
WESTERN STAR 48FX
WESTERN STAR WESTERN STAR

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