2007 Buick Rainier Owner's Manual - Page 403

How to Check Lubricant Front Axle When to Check Lubricant 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. Have it inspected and repaired. How to Check Lubricant To get an accurate reading, the vehicle should be on a level surface. The proper level is from 0 to 3/8 inch (0 to 10 mm) below the bottom of the filler plug hole, located on the rear axle. What to Use To determine what kind of lubricant to use, see Recommended Fluids and Lubricants on page 489. To get an accurate reading, the vehicle should be on a level surface. 403