GMC 1996 Sierra Owner's Manual page 327

Section 7 Maintenance Schedule
I
IMPORTANT:
I
KEEP ENGINE OIL
AT THE PROPER
LEVEL AND CHANGE AS
RECOMMENDED
This section covers the maintenance required for your
vehicle. Your vehicle needs these services to retain its
safety, depe.ndability and emission control performance.
7 -
1
Protection
Plan
Introduction
Your Vehicle and the Environment
Proper vehicle maintenance not only helps to keep your
vehicle i n good working condition. but also helps the
environment. All 1-ecommended maintenance procedures
are important. Improper vehicle maintenance can even
affect the quality of the air we breathe. Improper fluid
levels or the wrong tire inflation can increase the level
of emissions fr6m your vehicle. To help protect our
environlnent, and to keep your vehicle i n good
condition, please maintain your vehicle properly.