1994 GMC Suburban Owner's Manual - Page 344
1994 GMC Suburban Manual
Page 344 highlights
GASOLINE ENGINES WITH HEAVY DUTY EMISSIONS - MAINTENANCE SCHEDULEff A * An Emission Control Service ** See "Explanation of Scheduled Maintenance Services" it7 the Index. A Noise Emission Control Service W Applicable only to vehicles sold in the United States To determine the emissions classification of your engine, refer to "Selecting the Proper Maintenance Chart" in this section. TO404 t 7-10
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