
Maintenance  Schedule I - Gasoline  Engines  Heavy 
Duty Emissions 
24,000 Miles (40 000 km) 
0 Change  engine oil and filter (or every 3 months, whichever  occurs 
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 
IO" 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). 
first). 
An Emission Control Service. 
0 Check  rear/front 
axle fluid  level  and add  fluid as needed. Check 
constant  velocity  joints and axle seals for  leaking.'!''" 
3 Replace  air cleaner filter. Replace filter  more often under dusty 
conditions. 
An Em'ssiolz Control Sen?ice. 
3 For  2-Wheel  Drive vehicles only: Clean  and  repack the front wheel 
Z Replace fuel filter. Replace filter sooner if it is clogged.+ 
3 Adjust  timing  to underhood  label specifications. Inspect  the inside and 
outside  of the  distributor  cap  and rotor  for cracks. carbon tracking  and 
corrosion.  Clean or replace 
as needed. An E~~zission Control Senice. 
This  is a Noise  Emission  Control  Service. 
bearings  (or at each brake relining,  whichever occurs  first). 
If your vehicle has  a thermostatically  controlled  air cleaner, inspect all 
hoses and ducts for proper  hook-up. Be sure the valve works properly. 
An Emission Co11trol Service. This  is a Noise  Emission  Control 
Service. 
Inspect accessory  drive  (serpentine)  belt for cracks,  fraying and wear 
and  check  belt for proper tension. Adjust or replace  belt 
as needed. An 
Emission Control Service. 
0 Inspect shields and underhood insulation for  damage  or looseness. 
Adjust 
or replace as required. This  is a Noise  Emission  Control 
Service.  Applicable 
only to  vehicles  sold in the  United  States. 
(Continued) 
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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 For 2-Wheel  Drive vehicles only: Clean and repack the front wheel 
bearings  (or  at  each  brake relining, whichever  occurs first). 
0 Inspect  air cleaner  filter if you are driving in dusty conditions.  Replace 
Replace fuel filter. Replace filter sooner if it is clogged.? 
filter 
if necessary. 
An  Emission  Control Service. 
0 Inspect  accessory  drive  (serpentine)  belt for  cracks,  fraying and wear 
and check  belt for  proper  tension. Adjust  or replace belt 
as needed. An 
Emission  Control Service. 
0 Inspect shields and underhood  insulation  for  damage or looseness. 
Adjust 
or replace as required. This is a  Noise  Emission  Control 
Service.  Applicable  only  to vehicles  sold  in  the  United  States. 
If your  engine  has a thermostatically  controlled cooling  fan, inspect  all 
hoses and ducts  for  proper hook-up (or every 
12 months, whichever 
occurs  first). Be sure the valve works properly. 
This  is a  Noise 
Emission  Control  Service.  Applicable  only  to  vehicles  sold  in  t\
he 
United  States. 
DATE SERVICED BY: ACTUAL MILEAGE 
39,000 Miles (65 000 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). 
(Continued) 
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Maintenance Schedule I - Diesel Engines - 
12,500 Miles (20 000 km) 
Change  engine oil and filter (or every 3 months, whichever  occurs 
first). 
An Emission Control Service. 
Il 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 tnileage 
interval  (or 
every 12  months,  whichever OCCUTS first). 
15,000 Miles (24 000 km) 
ci Change  engine  oil and  filter  (or  every 3 months, whichever  occurs 
first). 
An Emissio~1 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 
(-1 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  12 months, whichever  occurs  first). 
17 Replace air  cleaner filter. Replace filter more often under dusty 
0 For 2-Wheel  Drive vehicles  only: Clean and repack the  front wheel 
conditions. 
An Emission  Control  Service. <' 
bearings  (or 
at each brake  relining, whichever  occurs  first). 
(Continued) 
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I Maintenance  Schedule I - Diesel  Engines I 
45,000 Miles (72 000 km) 
17 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 Replace air cleaner filter. Replace filter more often under dusty 
conditions. 
An Emissicrr? Control Service. * 
0 For  2-Wheel  Drive vehicles only: Clean  and repack  the front  wheel 
bearings (or at each brake relining, whichever  occurs first). 
0 Check  readfront  axle  fluid level and add fluid as needed. Check 
constant velocity  joints and axle  seals for leaking. 
$'* 
DATE  SERVICED BY: ACTUAL MILEAGE 
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I Maintenance  Schedule II - Diesel  Engines 
30,000 Miles (48 000 km) 
0 
0 
0 
Change  engine oil and filter  (or every 3 months, whichever  occurs 
first). 
An 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  12 months,  whichever  occurs  first). 
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 
spring1-y 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. 
Drain,  flush and refill the  cooling system with  new  coolant  (or  every 24 
months, whichever  occurs  first).  See  "Engine  Coolant" in the Index for 
what  to use. 
An  Ernission  Control Service. 
Also inspect the hoses  and  replace them if they are  cracked,  swollen or 
deteriorated.  Tighten all hose  clamps  (except  constant  tension clamps). 
Remove  debris  and clean the outside of the radiator  and  air 
conditioning  condenser. Wash the radiator  neck. 
To ensure  proper 
operation,  pressure test the radiator and  cap. 
Replace  air  cleaner  filter. 
An Emission  Coratrol Service. 
For 2-Wheel  Drive vehicles only: Clean  and repack the  front wheel 
bearings  (or at each brake  relining, whichever  occurs  first). 
Replace fuel filter. Replace  filter  sooner 
if it is clogged:? 
Inspect  shields and underhood  insulation  for  damage  or  looseness. 
Adjust 
or replace as required. This is a  Noise  Emission  Control 
Service.  Applicable  only  to vehicles  sold  in  the  United  States. 
(Continued) 
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60,000 Miles (100 000 km) 
o 
r 
0 
0 
0 
0 
E 
Change  engine oil  and filter (or every 3 months,  whichever  occurs 
first). 
An Emissim~  Control Ser~~ice. 
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). 
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 
.spari11gl~* 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. 
Drain,  flush  and  refill the cooling  system with new coolant  (or every  24 
months. whichever  occurs  first).  See "Engine Coolant'' 
in the  Index  for 
what 
to use. Ar? Emissioll  Cor1trol Service. 
Also inspect the hoses  and  replace  them if they are cracked,  swollen or 
deteriorated.  Tighten  all hose  clamps  (except  constant tension clamps). 
Remove  debris  and clean the outside 
of the  radiator  and air 
conditioning  condenser. Wash 
the radiator neck. To ensure proper 
operation,  pressure  test the radiator  and cap. 
Replace  air  cleaner  filter. 
An Emission Control Set-l*icv. 
For 2-Wheel  Drive vehicles  only: Clean  and  repack  the  front wheel 
bearings  (or at each  brake  relining,  whichever  occurs  first). 
Check  the crankcase  depression regulator  valve system  for any worn, 
plugged  or collapsed  hoses.  See service manual. 
AIZ E~ui.ssio~? Co11troI 
ScJr-\,ic*e. 
Replace fuel filter. Replace  filter sooner if it is clogged.-!- 
Check the 
EGR System (if equipped)  (except Code F engine) as 
described in the service manual. At7 EIII~SS~OII  Control Service. 
(C~)11tin~d) 
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Part C: Periodic  Maintenance  lnspections 
Listed below are inspections and  services which should  be performed  at 
least twice  a year  (for instance, each  spring and 
fall). You should  let your 
GM  dealer’s  service  department  or  other  qualified  service center  do these 
jobs.  Make  sure any necessary repairs  are completed  at once. 
Steering  and Suspension  Inspection 
Inspect the front and rear  suspension  and steering  system for damaged. 
loose  or  missing parts, signs  of wear, 
or lack  of  lubrication.  Inspect power 
steering lines and hoses  for proper hookup, binding,  leaks,  cracks,  chafing, 
etc.  (On  vehicles equipped  with manual steering gear, check  for  seal 
leakage.) 
Exhaust  System  Inspection 
Inspect the  complete  exhaust  system.  Inspect the  body  near the exhaust 
system. 
Look for broken.  damaged,  missing or  out-of-position  parts as well 
as  open  seams,  holes,  loose  connections, 
or other  conditions  which could 
cause  a heat  build-up 
in the floor  pan or could  let exhaust  fumes into the 
vehicle.  See  “Engine  Exhaust” 
in the Index. 
Accelerator  Control  System 
On gasoline  engines.  lubricate the pivot at the TBI throttle  lever stud  with 
engine 
oil. Do not oil any  accelerator  or  cruise control cables. Replace  any 
cables  that have  high effort  or  excessive  wear. 
Drive  Axle  Service 
Check readfront  axle  fluid level and  add as needed. Check constant  velocity 
Joints  and axle  seals  for  leaking. 
Transfer  Case  (Four-  Wheel  Drive)  Inspection 
Every 12 months or at  oil  change  intervals, check  front  axle and transfer 
case  and add  lubricant  when necessary.  Oil the control  lever pivot point and 
all exposed  control  linkage. Check  vent hose at transfer  case for kinks and 
proper  installation.  More  frequent  lubrication may  be required  on  off-road 
use. 
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USAGE 
Power  Steering  System Manual Transmission  (5-Speed 
with Low Gear,  RPO MT8) 
Manual Transmission  (5-Speed 
without  Low Gear, RPO  MG5) 
Automatic Transmission  Key  Lock  Cylinders 
FLUIDLUBRICANT 
GM  Power  Steering Fluid (GM Part 
No. 10500 I7 or  equivalent). 
Castrol  Syntorq' 
LT or equivalent 
(GM  Part No.  12346191 
- 1 gal.) 
(GM  Part 
No. I23461  90 - 1 qt.). 
Synchromesh  Transmission Fluid 
(GM  Part 
No. 12345349 or  equiva- 
lent). 
DEXR0N'-I11  Automauc 
Transmission  Fluid. 
Lubricate 
with Multi-Purpose Lu- 
bricant  (GM Part No. I2345  120) or 
synthetic SAE SW-30  engine  oil. 
Automatic  Transmission  Shift 
Linkage 
Clutch  Fork  Ball Stud  (5-Speed 
with  Low  Gear) 
Floor  Shift  Linkage 
Chassis  Lubrication 
Front Wheel  Bearings 
Differential,  Standard,  Front and 
Rear Axle 
Differential, Locking 
Transfer  Case  Engine 
oil. 
Chassis  lubricant  (GM Part 
No. 
12346003 or equivalent)  or lubri- 
cant meeting requirements  of  NLGI 
Grade  2, Category  LB or GC-LB. 
Engine 
oil. 
Chassis  lubricant  (GM Part No. 
I2346003  or  equivalent)  or  lubri- 
cant meeting  requirements  of NLGI 
Grade 
2, Category  LB or GC-LB. 
Wheel bearing lubricant  meeting 
requirements 
of NLGI  Grade 2, 
Category  GC  or GC-LB  (GM Part 
No. I2346003  or  equivalent). 
Axle Lubricant  (GM Part No. 
105227 
1 ) or SAE 8OW-90  GL-5 
Gear  Lubricant. 
Axle Lubricant  (GM Part 
No. 
105227 1) or  SAE  80W-90  GL-5 
Gear  Lubricant. 
DEXR0N"-111  Automatic 
Transmission  Fluid. 
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