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

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. Add only enough fluid to reach the proper level.

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