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Service bulletin SB 458

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 id10138250
Published by NHTSA2018-05-21
Manufacturer's numberSB 458
Manufacturer's date2018-04-24
NHTSA componentENGINE AND ENGINE COOLING; EQUIPMENT:RECREATIONAL VEHICLE/TRAILER:PLUMBING:POTABLE WATER:STORAGE TANK

NHTSA's summary

This Service Bulletin informs affected owners of model year 2017-2018 J4500 model coaches that the potential may exist for engine damage to occur if the lavatory tank is overfilled. If this occurs, it is possible for the water to overflow into the engine air filter. This Service Bulletin informs affected vehicle owners that MCI is providing the parts and labor to perform a retrofit at no cost to owners.

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, Equipment and accessories

Vehicles listed
MCI J45002017 to 2018

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