GM Service Manual Online
For 1990-2009 cars only

When to Check Lubricant

Refer to the Maintenance Schedule to determine how often to check the lubricant. See Part A: Scheduled Maintenance Services .

How to Check Lubricant

1500 Series shown, 2500 similar


Object Number: 809097  Size: B3

To get an accurate reading, the vehicle should be on a level surface.

The proper level for the 1500 Series is from 5/8 inch to 1 5/8 inch (15 mm to 40 mm) below the bottom of the filler plug hole. The proper level for the 2500 Series is from 0 to 1/2 inch (0 to 13 mm) below the bottom of the filler plug hole. The proper level for the 1500 and 2500 series vehicles with QUADRASTEER (4 Wheel Steer) is from 0 to 1/4 inch (0 to 6 mm) below the filler plug hole. Add only enough fluid to reach the proper level.

What to Use

Refer to the Maintenance Schedule to determine what kind of lubricant to use. See Part D: Recommended Fluids and Lubricants .