2007 Cadillac STS Owner's Manual - Page 417

Front Axle When to Check and Change Lubricant It is not necessary to regularly check the front axle fluid unless you suspect there is a leak or you hear an unusual noise. A fluid loss could indicate a problem. Have it inspected and repaired. To get an accurate reading, the vehicle should be on a level surface. If the level is below the bottom of the filler plug hole, located on the front axle, you may need to add some lubricant. What to Use Refer to the Maintenance Schedule to determine what kind of lubricant to use. See Recommended Fluids and Lubricants on page 516. How to Check Lubricant Bulb Replacement For the proper type of replacement bulbs, see Replacement Bulbs on page 419. For any bulb changing procedure not listed in this section, contact your dealer. A. Drain Plug B. Filler Plug 417