Hummer H2. Manual - part 2018

Courtesy of GENERAL MOTORS CORP.

Engine Oil Viscosity 

The recommended oil viscosity is SAE 5W-30. 

Engine oil viscosity, or thickness, has an effect on the fuel economy and on the cold-weather operation, such as 
starting and oil flow. Lower viscosity engine oils can provide better fuel economy and cold-weather 
performance. However, higher temperature weather conditions require higher viscosity engine oils for 
satisfactory lubrication. When the temperature is consistently above -18°C (0°F), use SAE 10W-30. SAE 20W-
50 or oils of other viscosity rating or quality designations are NOT recommended for use in any trucks at any 
time. 

Chassis Lubrication 

Refer to the illustration for the location of the lubrication points for the chassis. Lubricate the following 
components: 

z

The transmission shift linkage  

z

The park brake guides  

z

The underbody contact points  

z

The underbody linkage  

NOTE:

Using oils of any viscosity other than those recommended could result in 
engine damage. When choosing an oil, consider the range of temperatures the 
vehicle will be operated in before the next oil change. Then, select the 
recommended oil viscosity.

NOTE:

Do not lubricate the parking brake cables. Lubrication destroys the plastic 
coating on the cable.

 

2004 Hummer H2 

2004 GENERAL INFORMATION Maintenance and Lubrication - Hummer H2

  

Fig. 2: Lubrication Points (4WD) 
Courtesy of GENERAL MOTORS CORP. 

Callouts For Fig. 2 

Callout

Component Name

1

Transmission

2

Rear Axle Differential

3

Transfer Case

4

Clutch Actuator

5

Brake Master Cylinder

6

Oil Filter

7

Engine

8

Front Axle Differential

9

Front Propeller Shaft

10

Steering Linkage

 

2004 Hummer H2 

2004 GENERAL INFORMATION Maintenance and Lubrication - Hummer H2

  

Fig. 3: Lubrication Points (Rear-Wheel Drive) 
Courtesy of GENERAL MOTORS CORP. 

Callouts For Fig. 3 

Lubricating Joints that have Grease Fittings 

Refer to the illustration for the location of the grease fittings. 

Apply grease slowly while watching the grease seal. Apply the grease until the grease is seen bleeding from the 

Callout

Component Name

1

Propeller Shaft-Slip Joint

2

Rear Axle Differential

3

Clutch Actuator

4

Master Cylinder

5

Oil Filter

6

Steering Gear

7

Engine

8

Steering Linkage

9

Transmission

IMPORTANT: Wipe off all dirt from the grease fitting before lubricating the joint. Do not 

lubricate the ball joints unless the temperature of the ball joints is at least -12°C 
(10°F). During cold weather, allow the ball joints to warm up as necessary 
before being lubricated. Use a low-pressure grease gun on all joints in order to 
prevent seal damage.

 

2004 Hummer H2 

2004 GENERAL INFORMATION Maintenance and Lubrication - Hummer H2

  

seal. If the seal expands but you do not see any grease, do not apply any more grease. Allow time for the grease 
to bleed from the seal. 

Fig. 4: Lubrication Fittings-Steering Linkage 
Courtesy of GENERAL MOTORS CORP. 

Callouts For Fig. 4 

Callout

Component Name

1

Lubrication Fittings

 

2004 Hummer H2 

2004 GENERAL INFORMATION Maintenance and Lubrication - Hummer H2