1999 GMC Sierra 1500 Pickup Owner's Manual - Page 390
1999 GMC Sierra 1500 Pickup Manual
Page 390 highlights
Scheduled Maintenance Services GASOLINEENGINES WITH HEAVY DUTY EMISSIONS- I If your drivingconditionsmeetthosespecified in "ScheduledMaintenance FOOTNOTES: ' An Emission Control Service '*See"Explanation of ScheduledMaintenanceServices" in thissection. A AlsoaNoiseEmissionControlService IApplicableonly to vehicles sold in theUnitedStates t To determinetheemissionsclassification ofyourenginereferto"Selectingthe in Maintenance Chart" Proper TO339 7-1 0
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