GMC 2003 Sierra - Manual (Page 507)

50,000 Miles (S3 000 km)
J Change automatic transmissign fluid and filtoi if the
vehicle's GVWR is over ecoo lbs, if the vehicle hae
an Allison transmission or if the vehicle Is mainly
dnven under one or more of Ihese conditions:
- In heavy City tratfic where the oulside
lemperature regularly reaches 90" F or
higher.
- In hilly or mounlainous terrain.
” When doing frequent trailer towing.
- Uses such as found in taxi, police or delivery
service.
Excepi Aliison Transsnsssionr If yen de not use your
vebicie under any of these eondiisons, change the fhjfd
and filter 3t 100.000 mll^s {16S 000 km).
□ Automatic Transler Case Onty; Change transfer
case fluid.
52,500 Miles (87 500 km)
ij Check iiear/front axle fluid leva I and add fluid as
needed. Check constani velocity joinis and axle seals
for leaking.
U Rotate Hres. See Tire tnspeciion and RoiaHory on
роде 5-74 for proper rotatinn pattern and additional
informatton. (See footnote +J
60,000 Miles (100 000 km)
'Ll Chack rear/troni axle fluid level and add fluid as
needed. Check constant vaEoeîty Joints and axle seals
for ieaking.
J Rotate lires. See Tire inspection ami Ffotatiofí on
page 5^74 Ipr proper rotation pallem and addittonal
information. (See faotnoSe +.J
'J Replaça tuel filter. An Emfsswn Confrof Service,
(See tooincjfe f.)
□ Replacn engine air cleaner filter. An Embsion
Control Service.
J Inspect Evaporative Conirol System. Check all tueJ
and vapor lines and hoses for proper hook-up.
routing and condition. Check that the purge vatve
wodis properly, ii equipped. Replace as needed.
An Emission Control Service- (See footootE f,}
67,500 Miles (112 500 km)
□ Check rear/front axle fluid level and add fluid as
needed. Check constant velocity joints and axle seals
for leaking.
□ Roíale tines. See Tire /nspscifon and Rotation on
page 5-74 far proper rotation pattern and additional
infoitnatron. (See frx}tnoi&-r.}
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