2007 Hummer H3 Owner's Manual - Page 358

The proper level is from 0 to 3/8 inch (0 mm to 10 mm) below the bottom of the filler plug hole, located on the rear axle. Headlamp Aiming The vehicle has a visual optical headlamp aiming system. The aim has been preset at the factory and should need no further adjustment. However, if the vehicle is damaged in an accident, the headlamp aim may be affected and adjustment may be necessary. If oncoming vehicles flash their high beams at you, this may also mean the vertical aim needs to be adjusted. It is recommended that the vehicle is taken to your dealer for service if the headlamps need to be re-aimed. It is possible however, to re-aim the headlamps as described in the following procedure. What to Use See Recommended Fluids and Lubricants on page 440 to determine which kind of lubricant to use. Four-Wheel Drive It is recommended that the four-wheel drive transfer case fluid be checked and filled by your dealer. Front Axle It is not necessary to regularly check front axle fluid unless you suspect there is a leak or you hear an unusual noise. A fluid loss could indicate a problem. It is recommended that the front axle fluid be checked and filled by your dealer. 358