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GMC
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1985
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Forward Control 7.4 W, 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 - 4.8L 6-CYL
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Specifications
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Service Intervals
Service Intervals
REPLACEMENT INTERVALS
Components
Interval (Miles)
Oil Filter
Normal Use
12,000
Heavy Use
3000
Spark Plugs
30,000
PCV Valve and Filter
30,000
Air Filter
30,000
SYSTEM REFRIGERANT CAPACITY
Application
Ounces
All Models
48