[Beastmaster]

Most Hummer dealers will consider the desert or higher temp areas (Dallas and Phoenix included) as extreme weather areas.

The biggie about that isn't much. It basically means that you should at least follow at the minimum the standard A/B/C service schedule, and at best you should also follow the severe duty cycle in which you change the fluids a bit more often.

In my particular case (living in Phoenix), I do the following:

- Follow the A/B/C schedule like clockwork
- If you go into any water that is as deep as the rocker panels, lube all the grease points as soon as you can
- Before and after off roading, lube all the grease points
- Replace the stock mushroom cap with a centrifugal air cleaner (SMA and Predator both sell this). This mimics the AMG Desert Filtration Kit for HMMWV's.
- Replace the fluids in the geared hubs, transfer case, and transmission more often. Going to synthetics will help alleviate the need to do this.

If the prior owner took the truck in for service religiously, you will have little to no problems at all. Like JollyRoger, my truck's prior owner was not good about maintaining the truck, and I took about 6 months of time to get the truck to spec.