Hummer H1 (2006+). Manual - part 8

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General Information, Lubrication and Maintenance

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Diesel engine oil capacities are:

• 10.5 qts (9.9L) without filter change

• 12.25 qts (11.6L) with filter change

• 2.0 qts (1.9L) for engine oil cooler

Refer to Section 2 for more information regarding engine oil. 

Engine Coolant

Recommended engine coolant is a mixture of ethylene glycol antifreeze and water.

Use a mixture containing 50% DEX-COOL  and 50% water.

Radiator capacity is 7 qts (6.6L). System capacity is approximately 33 qts (31.2L).

Transmission/Transfer Case/Steering Gear and Pump Fluid

Recommended lubricant for the transmission, transfer case, and steering system is Dexron III automatic transmission fluid.

Approximate fluid capacities are:

• 1 qt (0.95L) for the steering gear and pump

• 3.5 qts (3.3L) for the transfer case

• 14 qts (13.3L) for the transmission, converter, and cooler

• 8.2 qts (7.7L) for the transmission (during fluid drain/refill)

Brake Fluid

Recommended brake fluid for all HUMMER H1 vehicles is DOT 3 brake fluid. Master cylinder approximate capacity is 1.64 pints
(0.78L). Brake system approximate capacity is 3.12 pints (1.5L).

Front and Rear Axle Lubricant

Recommended lubricant for axles is HUMMER H1 Synthetic Gear Lube 75W-90 with friction modifier. The approximate capacity
for one axle is 2 qts (1.9L).

Geared Fan Drive

Recommended lubricant for the GFD is HUMMER H1 Synthetic Gear Lube 75W-90 with friction modifier. The approximate ca-
pacity is 1.2 pt (0.6L).

Geared Hub Lubricant

Recommended lubricant for hubs is a heavy duty, multipurpose, API GL-5 gear lubricant, with viscosity ratings of 80W-90 or
75W-90.

The 80W-90 is an all purpose lubricant. The 75W-90 lubricant is suggested for use in areas where winter temperatures are consis-
tently below freezing.

Steering Linkage and Suspension Lubricant

Recommended lubricant for steering and driveline components is an NLGI LB, or GC-LB grade multipurpose chassis grease. Use
only those lubricants that display the NLGI certification symbol.

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Body Lubrication

Door hinges, linkage parts, cables, and other body components can be lubricated with a number of different lubricants. Suggested
lubricants and applications are:

• Window regulator mechanisms – spray white grease

• Window slides – silicone spray lube

• Door hinges – engine oil, ATF, or LPS brand spray lube

• Linkage/cables – LPS brand silicone spray lube

• Lock strikers – chassis grease, white grease, or LPS #3.

• Seat track – multipurpose chassis grease (NLGI-LB)

• Lock mechanisms –ATF, silicone spray lube, graphite lube

A/C Refrigerant and Compressor Oil

The only refrigerant that can be used is R-134a. No other refrigerant is recommended.

The only compressor oil recommended is PAG (polyalkylene glycol). It is the only oil compatible with refrigerant R-134a. No
other oil is recommended. Any PAG oil used should be compatible with General Motors specifications. 

A/C system capacities are:

• 11 fluid ounces (325 ml) of PAG oil

• 3 lb 3 oz (1.45 kg) refrigerant

LUBRICATION AND MAINTENANCE ITEMS

Engine Oil Level

The engine oil dipstick is at the driver side of the engine (Figure-1-19). Correct oil level is to the “F” mark. 

Check oil level only when the engine is shut down and the vehicle is on a level surface. Wait one minute after shut down to check.

Never overfill the engine. The excess oil will be churned into foam causing oil film breakdown and consequent engine damage.

Figure 1-19:   Oil Dipstick Location

Engine Oil and Filter Change

The oil filter is located on the driver side of the engine (Figure-1-20). A front mounted fill tube is used. 

The spin-on oil filter is only removed with a standard band-type tool. Coat the seal on a new filter with oil and clean the adapter
surface before installation. Tighten the filter by hand. Replace filter every 6,000 mi (9,700 km).

The oil pan drain plug has a gasket that should be replaced if cut, cracked, or distorted. Check the gasket seating surface on the oil
pan. Burrs or nicks can be smoothed with a fine tooth file. Also replace the drain plug if the threads are worn or damaged. Be sure
the plug is tightened to required torque of 16 lb-ft (22 N•m).

OIL DIPSTICK

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General Information, Lubrication and Maintenance

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Figure 1-20:   Oil Filter/Drain Plug Location

Figure 1-21:   Engine Oil Fill Location

Fuel Filter Service

Replace the filter element every 6,000 mi (9,600 km), or annually, whichever occurs first (Figure-1-22). See “Purging Air From
Diesel Filter” (Section 3). 

Figure 1-22:   Fuel Filter Location 

ADAPTER

OIL PAN

DRAIN PLUG

OIL FILTER

OIL FILLER CAP

FUEL FILTER

FUEL FILTER

PRIMING PUMP

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Transmission Fluid

Figure 1-23:   Transmission Dipstick Location 

Replace the transmission fluid filter each time the fluid is changed. Refill the transmission with Dexron

®

 III afterward.

Check transmission fluid level at least once each month. Procedure is as follows:

1.

Drive the vehicle until the transmission fluid is at normal operating temperature. Fluid must be hot to obtain accurate reading.

2.

Position the vehicle on a level surface.

3.

Shift the transmission into Park.

4.

Operate the engine at curb idle speed.

5.

Remove the transmission dipstick and check the level (Figure-1-23). Correct level is within the crosshatch marks on the dipstick.

6.

If the fluid level is too high, remove the excess through the fill tube using a suction gun and 3/16-in. teflon tubing. If level is
low, check for leaks and, if OK, add fluid in 1-2 ounce increments until level is correct.

CAUTION: Do not overfill the transmission. The excess fluid will be churned into foam resulting in overflow from the fill and
vent tubes, slip and flare during upshifts, fluid breakdown and eventual clutch failure.

7.

Check the fluid color and the condition. Normal color ranges from dark red to light pink. Fluid that is dark brown, black, or
orange and full of bubbles indicates a problem that may require overhaul.

Transfer Case Fluid

Check transfer case fluid level every 6,000 mi (9 700 km), or semiannually, whichever comes first. Remove fill plug and gasket.
Level should be within 1/2 in. (12.7 mm) of fill plug opening when transfer case is level. Install fill plug and gasket, and tighten to
15-25 lb-ft (20-33 N•m). Change fluid every 12,000 mi (19 000 km) or annually, whichever occurs first (Figure-1-24).

Inspect rubber plug in the shift rail roll pin access passage located near the shift lever for leakage. Replace plug if leakage is
present.

Figure 1-24:   Transfer Case Fill/Drain Plug Location

TRANSMISSION DIPSTICK

AND FILL TUBE

FILL PLUG

DRAIN PLUG