GMC 1986 P-Truck Service Manual page 29

OB-8 MAINTENANCE AND LUBRICATION
To determine the emissions classification for gasoline engine
equipped vehicles, refer to the certification label located on the edge
of the driver's door. If the Gross Vehicle Weight Rating (GVWR) in the
u p p e r le ft c o rn e r of the c e rtific a tio n la b e l is less tha n
8600 lbs./3 900 kg, your vehicle is equipped with " Light Duty Emis­
sions" ; if 8600 lbs./3 900 kg or more, your vehicle is equipped with
" Heavy Duty Emissions" .
Select the proper maintenance from pages 4 through 11 depending
on your vehicle's engine (gas or diesel) and engine emissions classifi­
cation.
Select and follow either Maintenance Schedule 1 or Maintenance
Schedule 2 based on how you use your vehicle.
MAINTENANCE SCHEDULE 1
Follow Maintenance Schedule 1 denoted by a white
operate your vehicle under one or more of the following conditions:
MAINTENANCE SCHEDULE 2
Follow Maintenance Schedule 2 denoted by a black
of the driving conditions specified in Maintenance Schedule 1 apply.
SELECTING YOUR VEHICLES
MAINTENANCE
DETERMINING GVWR AND EMISSIONS
CLASSIFICATION
SELECTING THE PROPER
MAINTENANCE CHART
SELECTING THE PROPER
MAINTENANCE SCHEDULE
• When most trips are less than 4 miles (6 kilometers).
• When most trips are less than 10 miles (16 kilometers) and out­
side temperatures remain below freezing.
• Idling for extended periods and/or low-speed operations such as
found in delivery, police, rental or taxi operation.
• Towing a trailer.
• Operating in dusty areas.
o
if you mainly
• only if none