
Service  Replacement  Part  and  Filter 
Recommendations 
- Gasoline  Engines 
Engine 4.3L 
VTN Z 
Oil Filter  PFS2 
Air  Cleaner 
A 178CW 
Filter 
PCV  Valve  CV789C 
Spark 
Plugs* .CR43TS 
Fuel Filter  GF48 
1 
Radiator  Cap 
RC36 
5.0L 
H 
PF12183- 
A348C 
cv774c 
.CR43TS 
GF48 
1 
RC36 
5.7L 
K 
PF1218q A348C 
cv774c 
.CR43TS  GF38 
1 
RC36 
+Four  Wheel  Drive  Vehicle 
- use a PFS2  oil filter 
Wse AC  copper-cored  resistor type spark plugs 
Service  Replacement  Part  and  Filter 
Recommendations 
- Diesel  Engines 
Engine 6.5L 6.5L 
VIN P S 
Oil Filter  PF1218 
PF1218 
Air  Cleaner  A644C 
A 1236C 
Fuel  Filter  TP 
1006  TP 
1 006 
Surge 
Tank Cap  RC33  RC33 
7.41 
N 
PF1218 
A348C 
cv774c 
.CR43TS  GF48 
I 
RC36 
6.51 
F 
PF1218 
A 1236C 
TP 
I006 
RC33 
6-84 
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Schedule I Intervals - Gasoline Engines  with  Heavy  Duty 
Emissions 
Every 
3,000 Miles  (5 000 km) 
Engine Oil  and Filter  Change  (or every 3 months, whichever  occurs  first) 
Chassis  Lubrication  (or every 
3 months,  whichever  occurs  first) 
Drive Axle  Service 
At 6,000 Miles (10 000 km) - Then  Every 12,000 Miles (25 000 km) 
Tire Rotation 
Every 12,000 Miles (20 000 km) 
Air Cleaner  Filter Inspection, if Driving in Dusty  Conditions 
Front Wheel  Bearing Repack  (or  at Each Brake Relining)  (2-Wheel Drive 
Only 
1 
Fuel Filter  Replacement 
Engine Accessory  Drive  Belt Inspection 
Shields 
and Underhood  Insulation  Inspection 
Thermostatically  Controlled  Engine Cooling  Fan Check  (or every 
12 
months, whichever  occurs  first) 
Every 24,000 Miles  (40 000 km) 
Cooling  System  Service  (or  every 24 months, whichever  occurs  first) 
Air  Cleaner  Filter Replacement 
Engine  Timing  Check 
Thermostatically  Controlled  Air Cleaner Inspection 
Air Intake  System Inspection 
Every 27,000 Miles (45 000 km) 
Spark Plugs Replacement 
Every 30,000 Miles  (50 000 km) 
Clutch Fork  Ball Stud Lubrication  (%Speed  Transmission with Deep-Low 
Only) 
7-7 
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Every 24,000 Miles (40 000 km) 
Cooling  System  Service (or every  24 months,  whichever  occurs  first) 
Air  Cleaner  Filter Replacement 
Front Wheel  Bearing Repack  (or at Each  Brake  Relining)  (2-Wheel Drive 
Only 
1 
Fuel Filter  Replacement 
Engine  Timing Check 
Thermostatically  Controlled Air  Cleaner  Inspection 
Air Intake  System Inspection 
Every 27,000 Miles (45 000 km) 
Spark  Plugs  Replacement 
Every 30,000 Miles (50 000 km) 
Clutch Fork Ball Stud Lubrication  (5-Speed Transmission with Deep-Low 
Only) 
Every 50,000 Miles (83 000 km) 
Automatic  Transmission  Service 
Every 60,000 Miles (100 000 km) 
Spark Plug Wire Inspection 
Exhaust 
Gas Recirculation  (EGR) System Inspection 
Fuel  Tank,  Cap and Lines  Inspection 
Evaporative  Emission  Control  System Inspection 
Electronic  Vacuum Regulator  Valve (EVRV) Inspection 
Schedule I Definition - Diesel Engines 
Follow  Maintenance  Schedule I if any one of these is true  for your  vehicle: 
0 
0 
0 
0 
Most trips  are less  than 5 to 10 miles (8 to 16 km).  This is particularly 
important  when outside  temperatures  are  below freezing. 
Most trips  include  extensive  idling  (such as  frequent  driving 
in stop and 
go traffic). 
You  operate  your  vehicle 
in dusty  areas or off-road  frequently. 
You  frequently  tow 
a trailer. 
Schedule I should also be followed if the vehicle is used for delivery 
service.  Dolice, taxi, 
or other commercial  application. 
7-9 
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LI 
c 
Maintenance Schedule I - Gasoline  Engines  With 
Light  Duty  Emissions 
(Contimed) 
Drain, flush  and refill  cooling  system (or every 24 months, whichever 
occurs  first).  See  "Engine  Coolant'' 
in the lndex  for what to use. 
Inspect hoses. Clean radiator. condenser. pressure  cap and  neck. 
Pressure  test 
the cooling system and pressure  cap. An Emission  Control 
Service. 
For 2-Wheel Drive vehicles  only: Clean  and repack  the front  wheel 
bearings  (or at each brake relining, whichever  occurs  first). 
Replace  spark plugs. 
An E~~zissior~ Corztrol Ser-vice. 
Replace  air cleaner filter.  Replace  filter more often under dusty 
conditions. 
An Emission Cor~tr-01 Service. 
Rotate tires.  See "Tire  Inspection  and Rotation" in the lndex for proper 
rotation pattern  and additional information. 
I DATE I ACTUAL MILEAGE I SERVICED BY: 
33,000 Miles (55 000 km) 
0 Change  engine  oil and  filter  (or every 3 months, whichever  occurs 
first). 
An Er7rissiou Contmi Service. 
0 Lubricate  the front  suspension,  king pin bushings, steering  linkage, 
transmission  shift  linkage, transfer case shift linkage,  parking brake 
cable  guides,  rear driveline  center  splines,  front  axle propshaft  splines, 
brake pedal  springs  and clutch pedal  springs. 
Ball joints  and king  pin 
bushings  should  not  be lubricated  unless their temperature  is 
10" F 
(-I 2" C), or higher.  When  weather is cold, let  the ball joints  and king 
pin bushings  warm up before lubrication  or they could be damaged. 
Perform 
each of the listed lubrication  service items  at this mileage 
interval  (or every 
6 months,  whichever  occurs  first). 
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60,000 Miles (100 000 km) 
c; 
0 
0 
0 
il 
0 
Change  engine oil and filter  (or every 3 tnonths. whichever occurs 
first). 
AI? Emission Control Service. 
Lubricate  the front suspension. king  pin bushings,  steering linkage, 
transmission  shift linkage, transfer  case shift linkage, parking brake 
cable  guides,  rear driveline  center splines. front axle propshaft splines. 
brake  pedal springs  and clutch  pedal springs.  Ball joints  and king 
pin 
bushings  should  not  be lubricated unless their temperature  is 10" F 
(-12" C), or higher.  When weather is cold, let the  ball  joints  and king 
pin  bushings  warm up before lubrication  or they  could  be damaged. 
Perform each  of the  listed  lubrication service items  at  this mileage 
interval  (or every 
6 months, whichever occurs  first). 
Check rear/fi-ont axle fluid level and add fluid as needed. Check 
constant 
-\;elociry joint5 and axle seals for leaking.';'';' 
For  2-Wheel  Drive vehicles only: Clean and repack the front  wheel 
bearings  (or at each brake relining, whichever  occurs  first). 
Inspect  engine accessory drive belt. 
An Emissiolz  Comrol  Ssrvice. 
Drain, flush and refill  cooling  system (or  every 24 months, whichever 
occurs  first).  See  "Engine  Coolant" 
in the lndex  for what to use. 
Inspect hoses. Clean radiator, condenser, pressure  cap and  neck. 
Pressure  test  the cooling system  and pressure  cap. 
,411 Erltission Control 
Service. 
Replace spark plugs. AI? Emission Control Service.. 
Replace air  cleaner  filter. Replace filter  more often  under dusty 
conditions. 
Arz Emission Colztrol Service. 
Inspect fuel  tank,  cap and lines  for  damage  or leaks . Inspect fuel  cap 
gasket  for any  damage.  Replace parts  as needed. 
A17 E~nission Control 
Service. -i- 
7-26 
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0 
0 
0 
0 
0 
Check readfront  axle fluid  level  and  add  fluid as needed. Check 
constant  velocity  joints and axle seals for leaking.*’*’ 
For  2-Wheel  Drive  vehicles only: Clean  and repack  the front  wheel 
bearings  (or at each brake relining, whichever  occurs  first). 
Drain, flush  and  refill cooling  system  (or every 
24 months, whichever 
occurs  first).  See  “Engine Coolant” 
in the  Index for what  to use. 
Inspect hoses. Clean radiator, condenser, pressure  cap and  neck. 
Pressure test  the cooling  system  and pressure  cap. 
AI1 Emissiorr  Cor?tro/ 
Se n?ic.e. 
Replace  spark plugs. Au Emissiorz  Control Senice. 
Replace  air  cleaner filter. An Emissiorl  Cofltrol Service. 
DATE  SERVICED BY: ACTUAL 
MILEAGE I 
37,500 Miles (62 500 km) 
0 Change  engine  oil and  filter  (or every 12 months, whichever  occurs 
first). 
An EmissioM  Control SorLice. 
0 Lubricate the front suspension,  king  pin bushings,  steering linkage, 
transmission  shift linkage, transfer case shift  linkage, parking brake 
cable  guides,  rear driveline center splines.  front  axle propshaft splines, 
brake  pedal springs and clutch  pedal springs.  Ball joints  and king  pin 
bushings  should 
not be lubricated unless their temperature is 10” F 
(-12” C), or  higher.  When  weather is cold, let the  ball  joints  and king 
pin bushings  warm 
up before lubrication  or they could  be damaged. 
Perform each  of the listed lubrication service items  at this mileage 
interval 
(or every 12 months, whichever  occurs  first). 
7-30 
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I 
Maintenance  Schedule II - Gasoline  Engines  With 
Light  Duty  Emissions 
0 Replace spark plugs. At1 Emission  Control  Senlice. 
0 Inspect spark plug wires. Ai7 Emission Control  Service. ; 
0 Replace  air  cleaner filter. An E~~zission Control Sunice. 
- 
r! Inspect fuel tank, cap and lines for  damage or leaks. Inspect fuel  cap 
gasket  for  any  damage.  Replace parts 
as needed. An E~nission Control 
Service. ? 
DATE 
SERVICED BY: ACTUAL MILEAGE I 
< 
Maintenance  Schedule I - Gasoline  Engines  Heavy 
Duty  Emissions 
The  services  shown in this schedule  up to 60.000  miles ( 100 000 km)  should 
be  performed  after 
60.000 miles (100 000 km) at the same intervals. 
Footnotes 
*<: Drive  axle  service: 
a 
a 
0 
a 
Locking Differential - Drain  fluid and refill at first engine  oil change. 
At  subsequent  oil changes,  check fluid level  and  add fluid as needed. 
If 
driving in dusty  areas  or towing  a trailer, drain fluid and refill every 
15,000  miles 
(25 000  km). 
Standard Differential 
- Check fluid level  and add fluid as needed  at 
every  engine  oil change. 
If driving in dusty  areas or towing a trailer, 
drain fluid and refill every 
15,000 miles (25 00 km). 
More  frequent  lubrication  may  be required for  heavy-duty or off-road 
use. 
3500 HD Models with applications requiring extreme overload/trailer 
towing  conditions  and high  speed  (above 
45 mph or 72 km/h) 
conditions  for  extended periods  of time must  have the drive  axle fluid 
changed every 
3,000 miles (5 000 km)  or 3 months, whichever occurs 
first,  or must  use 
75W-140 synthetic fluid meeting GM specifications. 
See  “Recommended  Fluids and Lubricants” 
in this section. 
7-34 
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Maintenance  Schedule I - Gasoline  Engines  Heavy 
Duty 
Emissions 
(Continued) 
0 Check  readfront  axle  fluid level and add fluid as needed. Check 
constant  velocity joints and axle seals  for  leaking.** 
0 Replace spark plugs. An Emission Control Service. 
I DATE I ACTUALMILEAGE I SERVICED BY: 
30,000 Miles (SO 000 km) 
0 Change  engine  oil and filter  (or  every 3 months, whichever occurs 
first). 
An Emission Control Service.. 
0 Lubricate the  front suspension, king pin bushings, steering linkage, 
transmission  shift linkage, transfer  case shift linkage, parking brake 
cable  guides,  rear driveline  center  splines, front axle propshaft  splines, 
brake  pedal springs and clutch pedal  springs. Ball joints  and king  pin 
bushings  should not be lubricated unless their temperature  is 10” 
F 
(-12”  C),  or higher.  When  weather is cold, let the  ball  joints and king 
pin  bushings warm  up before lubrication  or they  could  be damaged. 
Perform  each 
of the listed lubrication service  items at this mileage 
interval  (or every  12 months, whichever  occurs  first). 
0 Check readfront  axle fluid level and add fluid as needed. Check 
constant  velocity  joints and axle seals  for leaking.$:‘$ 
0 For vehicles equipped  with a 5-speed manual transmission with deep 
low:  Lubricate  the clutch fork ball stud through  the fitting  on the clutch 
housing.  Lubricant must  be added 
spnringl! to the fitting, as very  little 
is required to lubricate the ball stud  surface. Do not add lubricant more 
often than specified. 
Too much  lubricant  will  damage  the  clutch 
assembly. 
0 Rotate  tires. See “Tire Inspection  and Rotation”  in the Index for proper 
rotation pattern  and additional information. 
DATE  SERVICED BY: ACTUAL  MILEAGE 
J 
7-42 
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