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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 (Single Page)
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Engine Performance
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Adjustment
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Tune-Up - Diesel
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Specifications
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Service Intervals
Service Intervals
REPLACEMENT INTERVALS
Component
Interval (Miles)
Oil Filter
2.2L
Normal Use
7500
Heavy Use
3000
6.2L
Normal Use
5000
Heavy Use
2500
Air Cleaner Element
30,000
Fuel Filter
2.2L
30,000
6.2L
15,000
Auto. Trans. Filter (Heavy Use)
15,000
EGR Pressure Valve
(1)
15,000
(1)
Check every 5000 miles.