GMC 2006 Sierra 1500 Pickup Owner's Manual page 556

Service and Miles (Kilometers)
Except Allison Transmission
automatic transmission fluid and filter
(severe service). See footnote (h).
Except Allison Transmission
automatic transmission fluid and filter
(normal service).
Four-wheel drive with automatic transfer
case only: Change transfer case fluid.
See footnote (g).
Inspect evaporative control system.
An Emission Control Service. See
footnotes † and (k).
Replace spark plugs and inspect
spark plug wires. An Emission
Control Service.
5-speed manual transmission only:
Change manual transmission fluid.
Engine cooling system service
(or every five years, whichever occurs
first). An Emission Control Service. See
footnote (i).
Inspect engine accessory drive belt.
An Emission Control Service. See
footnote (q).
6-8
Additional Required Services (cont'd)
25,000
(41 500)
®
: Change
®
: Change
50,000 75,000
(83 000) (125 000)
100,000 125,000
(166 000) (207 500)
150,000
(240 000)