Service Intervals & Specifications

REPLACEMENT INTERVALS

Component

Interval (Miles)

Accessory Drive Belt

⁽¹⁾ 60,000

Air Filter

30,000

Automatic Transfer Case Fluid

50,000

Automatic Transmission External Control Main Filter (Allison)

7500

Automatic Transmission Fluid & Filter

⁽²⁾ Or ⁽³⁾

Engine Coolant

150,000

Fuel Filter

30,000

Manual Transmission Fluid (Sierra & Silverado Only)

150,000

Oil & Oil Filter

⁽⁴⁾

PCV

100,000

Spark Plugs

100,000

⁽¹⁾	Inspect and replace as necessary.

⁽²⁾	On Allison transmissions, if used under severe conditions, replace every 25,000 miles.

⁽³⁾	On all other transmissions, if vehicle's GVWR is greater than 8600 lbs (3900 kg) or if used under severe conditions, replace every 50,000 miles. If used under normal conditions, replace every 100,000 miles.

⁽⁴⁾	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.