1999 GMC Sierra 1500 Pickup Owner's Manual - Page 396
1999 GMC Sierra 1500 Pickup Manual
Page 396 highlights
Scheduled Maintenance Services 6.2L AND 6.5L DIESEL ENGINESIf yourdrivingconditionsmeetthosespecifiedin"ScheduledMaintenance Services" in this section,useMaintenanceSchedule I (4. 7-1 6
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