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Service bulletin No. 156-20

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 id10183518
Published by NHTSA2020-12-02
Manufacturer's numberNo. 156-20
Manufacturer's date2020-11-30
NHTSA componentEQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY

NHTSA's summary

Instructions for cleaning the radiator in the event that vertical stripes or spots are visible on the middle radiator.

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, Labels and manuals, Cooling system, Radiator

Vehicles listed
PORSCHE 718 SPYDER2020
PORSCHE CAYMAN2020

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