Use GM Power Steering fluid, or its equivalent.
FLUID LEVEL CHECK
See Figures 1, 2, 3, and 4
On models equipped with a remote reservoir, the fluid level should be1/2-1 in. (13-25.4mm) from the top when the wheels are turned to the extreme left position.
The power steering pump reservoir is located at the front left-side of the engine.
Check the dipstick in the pump reservoir when the fluid is at operating temperature. The fluid should be between the HOT and COLD marks. If the fluid is at room temperature, the fluid should be between the ADD and COLD marks. The fluid does not require periodic changing.
On systems with a remote reservoir, the level should be maintained approximately 1 / 2 -1 in. (13-25mm) from the top with the wheels in the full left turn position.