SERIES 60 ON-HIGHWAY ENGINE OPERATOR'S GUIDE Certification Labels emissions regulations for its particular application. It also gives the operating conditions under which certification was made. See Figure 2. If required, a certification label is attached to the valve rocker cover. This label certifies that the engine conforms to federal and certain state Figure 2 Typical Engine Certification Labels All information subject to change without notice. 13 DDC-SVC-MAN-0039 Copyright © 2009 DETROIT DIESEL CORPORATION