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GMC
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1989
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Forward Control 6.2 J, Standard
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Repair and Diagnosis
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Engine Performance
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Adjustment
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Tune-Up - 6-CYL
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Specifications
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Service Intervals
Service Intervals
REPLACEMENT INTERVALS
Component
Interval (Miles)
Air Filter
30,000
Coolant
30,000
Fuel Filter
60,000
Oil & Filter
Normal Service
7500
Severe Service
3000
PCV Valve
60,000
Spark Plugs
30,000