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Service Intervals & Specifications

REPLACEMENT INTERVALS

Component Interval (Miles)
Sierra & Silverado
Accessory Drive Belt (1) 60,000
Air Filter 30,000
Automatic Transfer Case Fluid 50,000
Automatic Transmission Fluid & Filter (2)
CNG In-Line Filter (CNG Engines) 60,000
Engine Coolant 150,000
Fuel Filter 30,000
Manual Transmission Fluid 150,000
Oil & Oil Filter (3)
PCV (1) 100,000
Spark Plugs (4)
Except Sierra & Silverado
Accessory Drive Belt (1) 60,000
Air Filter 30,000
Automatic Transfer Case Fluid 50,000
Automatic Transmission Fluid & Filter (2)
CNG In-Line Filter (CNG Engines) 60,000
Engine Coolant 150,000
Fuel Filter 30,000
Oil & Oil Filter (3)
PCV (1) 100,000
Spark Plugs (4)
(1) Inspect and replace as necessary.
(2) If vehicle's GVWR is greater than 8600 lbs (3900 kg) or is used under severe conditions, replace every 50,000 miles. If used under normal conditions, replace every 100,000 miles.
(3) If used under severe conditions, replace every 3000 miles. If used under normal conditions, replace as indicated by CHANGE OIL SOON light or every 12 months, whichever comes first.
(4) On CNG engines, replace at 60,000 miles. On gasoline engines, replace at 100,000 miles.
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