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NOTICE: 
Don’t  let  anyone tell  you that  underinflation  or  overinflation  is 
all  right.  It’s  not. 
If’ your  tires  don’t  have  enough  air 
(underinflation) 
you can  get: 
0 Too much  flexing 
Too much  heat 
0 Tire  overloading 
Bad  wear 
Bad  handling 
0 Bad  fuel  economy. 
If your  tires  have  too  much  air  (overinflation), you can  get: 
Unusual wear 
Bad  handling 
Rough  ride 
Needless  damage from road  hazards. 
When to Check 
Check your tires once  a month or more. Also, check the  tire pressure  of the 
spare  tire. 
How to Check 
Use a good quality  pocket-type gage to check tire pressure. Simply looking 
at the tires  will not tell  you the pressure, especially 
if you have  radial  tires 
- which  may look properly inflated even  if they’re  underinflated. 
If  your tires have  valve  caps, be sure to put them back  on. They help prevent 
leaks  by keeping  out  dirt and moisture. 
Tire  Inspection  and  Rotation 
Tires should be  inspected  every 6,000 to 8,000 miles (10 000 to 13 000 km) 
for any signs of unusual  wear. If unusual wear  is present, rotate your tires as 
soon as possible  and check  wheel alignment.  Also  check  for  damaged  tires 
or  wheels.  See  “When  it’s Time  for  New Tires” and  “Wheel Replacement” 
later  in this  section  for more  information. 
If your vehicle has dual rear 
wheels,  also  see 
“Dual Tire Operation”  later in this section. 
6-59 
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        Page 349 of 488
CranKcase  Capacity 
ENGINE 
4.3L 5  .OL 
5.7L“ 
6.5L 
6.5L 
6.5L 
7.4L>$ 
VIN 
Z 
€4 
K 
P 
S 
F 
N 
QUANTITY WITH 
FILTER* 
4.5 Quarts  (4.3  Liters) 
5 Quarts (4.8 Liters) 
5  Quarts  (4.8  Liters) 
7 Quarts (6.5  Liters) 
7  Quarts 
(6.5 Liters) 
7 Quarts  (6.5 Liters) 
7  Quarts  (6.5  Liters) 
After refill, the  level 
MUST be checked  as outlined  under “Engine  Oil  And 
Filter Recommendations” 
in Section 5. 
All  quantities  are approximate. 
“Add  one  additional quart  for 
C3500 HD Models. 
+Oil filter should  be changed  at EVERY oil change. 
Fuel  Tank  Capacity 
TYPE 
Gasoline/Diesel 
with  Short  Bed 
with  Long  Bed 
Crew  Cab 
Standard 
Chassis-Cab  Models 
Standard  (Side Tank) 
Optional  (Rear Tank) 
3500 HD Models 
Standard  (Side Tank) 
Optional  (Rear Tank) 
QUANTITY 
26 Gallons  (98  Liters) 
34 Gallons 
(1 28  Liters) 
34 Gallons 
(1 28 Liters) 
23  Gallons  (87  Liters) 
3 
1 Gallons (1 17 Liters) 
23 Gallons  (87  Liters) 
3 1 Gallons ( 117 Liters) 
All  quantities  are 
for a completely dry tank  and are approximate. 
6-83 
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        Page 350 of 488
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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        Page 361 of 488

Every 30,000 Miles (50 000 km) 
Air Cleaner  Filter  Replacement 
Spark  Plug Replacement 
Fuel  Filter  Replacement 
Clutch 
Fork Ball  Stud  Lubrication  (5-Speed Manual Transmission  With 
Deep-Low  Only) 
Cooling  System  Service  (or every 
24 months, whichever  occurs  first) 
Every 50,000 Miles (83 000 km) 
Automatic  Transmission  Service  (severe  conditions only) 
Every 60,000 Miles (100 000 km) 
Engine Accessory  Drive Belt Inspection 
Spark Plug Wire Inspection 
Engine  Timing  Check 
Fuel Tank,  Cap and Lines Inspection 
Schedule 11 Definition - Gasoline  Engines  With  Light Duty 
Emissions 
Follow  Schedule I1 only if none of the conditions  from  Schedule I is true. 
Schedule  I1 Intervals - Gasoline Engines  With Light  Duty 
Emissions 
Every 
7,500 Miles (12 500 km) 
Engine  Oil and  Filter  Change  (or  every 12 months, whichever  occurs  first) 
Chassis  Lubrication  (or every 
12 months, whichever  occurs  first) 
Drive  Axle Service 
At 7,500 Miles (12 500 km) - Then  Every 15,000 Miles (25 000 km) 
Tire Rotation 
7-5 
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        Page 362 of 488

Every 30,000 Miles (50 000 km) 
Cooling System Service (or every 24 months) 
Spark  Plug Replacement 
Fuel  Filter  Replacement 
Air  Cleaner  Filter Replacement 
Front Wheel Bearing Repack 
Every 50,000 Miles (83 000 km) 
Automatic Transmission Service (severe conditions  only) 
Every 60,000 Miles (100 000 km) 
Spark  Plug Wire Inspection 
Engine  Accessory Drive Belt Inspection 
Fuel Tank, 
Cap and  Lines Inspection 
Engine  Timing Check 
Schedule 1 Definition - Gasoline  Engines  With  Heavy  Duiy 
Emissions 
I 
Follow Maintenance  Schedule I if any  one of these is true for your vehicle: 
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,  police, taxi,  or  other  commercial application. 
7-6 
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        Page 364 of 488

Every 50,000 Miles (83 000 km) 
Automatic Transinission 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 Control System Inspection 
Electronic  Vacuum Regulator  Valve 
(EVRV j Inspection 
Schedule  I1 Definition - Gasoline Engines  With  Heavy  Duty 
Emissions 
Follow Schedule TI only if none of the  conditions  from Schedule I is true. 
Schedule  I1 Intervals - Gasoline  Engines with-Heavy  Duty 
Emissions 
Every 
6,000 Miles (10 000 km) 
Engine Oil and Filter Change (or every 3 months.  whichever occurs  first) 
Clussis Lubrication (or every 3 months,  whichever occurs first) 
Drivc Axle  Scrvice 
At 6,000 Miles (10 000 km) - Then  Every 12,000 Miles (20 000 km) 
Tire Rotation 
Every 12,000 Miles (20 000 km) 
1 
Engine Accessory  Drive  Belt Inspection 
Shields  and Underhood  Insulation Inspection 
Thermostatically  Controlled Engine Cooling 
Fan Check (or every 12 
months, whichever  occurs  first) 
7-8 
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        Page 365 of 488

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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        Page 367 of 488

Every 60,000 Miles (100 000 km) 
Crankcase Depression  Regulator Valve (CDRV)  System  Check 
Engine  Accessory  Drive Belt Inspection 
Fuel Tank,  Cap and Lines  Inspection 
Evaporative  Control System Inspection 
Exhaust  Gas Recirculation  (EGR) System  Inspection 
(if equipped) 
Exhaust  Pressure  Regulator Valve Inspection 
I Schedule 11 Definition - Diesel Engines 
Follow  Schedule II on!\- if none ofrhe conditions i'wm Schcdtilc I Is truc. 
-- 
I Schedule  I1 lntervals - Diesel  Engines 1 
Every 5,000 Miles (8 000 km) 
Engine Oil and Filter  Change (or every 12 months, whichever  occurs  first) 
Chassis  Lubrication 
(or every 12 months,  whichever  occurs  first) 
Drive  Axle Service 
At 5,000 Miles (8 000 km) - Then  Every 10,000 Miles (16 000 km) 
Tire Rotation 
Every 10,000 Miles (16 000 km) 
Shields  and Underhood  insulation  Inspection 
Air Intake  System Inspection 
Thermostatically  Controlled Engine  Cooling  Fan Check  (or every 
I2 
months,  whichever  occurs  first) 
Every 30,000 Miles (48 000 km) 
Cooling  System  Service  (or every 24 months,  whichever  occurs  first) 
Front Wheel  Bearing Repack  (or 
at Each Brake  Relining)  (2-Wheel  Drive 
Fuel  Filter  Replacement 
Air  Cleaner  Filter Replacement 
Clutch Fork  Ball  Stud Lubrication  (5-Speed Transmission  with  Deep-Low 
Only) 
Only) 
7-11 
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