GMC 2003 Sierra - Manual (Page 506)

25.000 Miles (41 500 km)
J Allison Transmission Onl^fL Change automatic
Iransmtssion fluid and filters if the vehicte la mainly
driven under one or more of these condilions’
- In heavy cily traffic where the outside
temperature regularly reaches 90" F (32'"C) or
higher
- In
hilly or mouniainoijs terrain.
- When doing frequent trailer towing.
- Uses such as fourid in eskì , pctice or delivery
service,
If you don'r use your vehiu!9 under ¿ny af these
condffions. chaffge the ffuid actd fifter every
50.000 miies {S3 000 km).
30.000 Miles (50 000 km)
J Checli rear/frant ajrle fluid level and add fluid as
needed. Check constant velocity joints and акЗе seals
tor leaking,
□ Rotate tires. Sea Tire inipeciioo and Flotation on
page 5-?4 (or proper rotation paltem and additional
lnfofmatior>, f5ee toofntire +.)
J Replace fuel tiller An Enussfon Control Service.
{See foainoie f.}
Zi Replace engine air cleaner filter. An ^mission
Contro! Service.
37,500 Miies (Б2 500 km)
J Check rear/fronl axle fluid level and add fluid as
needed Check constant velocity Joints and axte seals
for leaking.
J Rotate ijres. See Tire inspection and Hotaiion on
page 5-74 for proper rotation partem and additional
intormalion. (See toolnote
45,000 Miles (75 000 km)
J lns[oect engine air cfeangr filler if you aiie driving In
dusty conditions. Replace Titer if necessary.
An Emission Conlroi Service. i^See /iooirTOJe j,¡
J Check rear/iront axle Huid level and add Huid as
needad. Check oonslanf velocity joints and axle seals
tor leaking.
□ Rotate tires. &ee Tire ir\&pectior} and Ftotatian an
page 5-74 tor proper rotatron pattern and additional
infornnation. (See faotnoie
6'7