<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">ust curious - I would love to get a reliable used H1 down the road, assuming the newer models are more reliable than the older ones... </div></BLOCKQUOTE>
The H1 factory recommended maintenance doesn't change from year to year - The '92 maintenance schedule is virtually the same as the '04 maintenance schedule.
The H1 gets an "A" service every 3k, and "A & B" service every 6k, and an "A,B & C" service every 12k miles. These maintenance intervals are cut in half for "Severe Operation", so 1500/3000/6000 miles instead of 3000/6000/12000 miles.
Here is a maintenance checklist for the A, B & C services:
http://www.amghummer.com/Maintenance...duledMaint.htm
The newer trucks aren't any more "reliable" per se than an older truck, although the N/A trucks seem to be more easily understood than the electronic engine management associated with the 6.5 TD engines.
If you have an H1 that has been properly maintaned, and you continue to properly maintain it - you will likely not have any unexpected problems. Most H1 horror stories you have heard are associated with a "used" H1 that did not have regularly scheduled maintenance & the new owner is beside him/herself.
Keep in mind that there are only a few hundred H1's produced each year, compared to 30,000 or so H2&3's produced, so the technicians and mechanics rarely get to see & work on them...making it take more time & cost more at the dealer. The H1 systems (geared hubs, ctis, etc) are unique, and dealers do not commonly "stock" very many H1 parts & are unfamiliar with troubleshooting these systems, making them tend to replace more than they need to so the customer can get back on the road quickly.
Many H1 owners rely on the "Hummer Maintenance CD" and the HML & do their own maintenance because it's a very easy truck to work on & in many cases it's quicker to do the maintenance repair yourself than go to the dealer & wait for parts.
You can see why many H1's are in ill repair - if you wheel on a regular basis (severe operation), just the C service needs to be done every 6K miles & the dealer cost is over $1,200 to perform it.
I'm not particularly mechanically inclined, but I do all my own maintenance, and have not had any problems in 45k miles. I wheel with a group of other H1's owners that have had similar experience.
Good luck, there are several resources to look into before buying an H1. Get a good one & enjoy it!