2006 Pontiac Montana SV6 Owner's Manual - Page 350

All-Wheel Drive If you have an all-wheel-drive vehicle, be sure to perform the lubricant checks described in this section. All-wheel-drive vehicles have two additional systems that need lubrication. How to Check Lubricant Transfer Case (Power Transfer Unit) When to Check Lubricant Refer to the Maintenance Schedule to determine how often to check the lubricant. See Scheduled Maintenance on page 6-4. 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 transfer case, you will need to add some lubricant. Add enough lubricant to raise the level to the bottom of the filler plug hole. What to Use Refer to the Maintenance Schedule to determine what kind of lubricant to use. See Recommended Fluids and Lubricants on page 6-11. 5-46