My Jeep says I can change the oil every 7,000 miles.
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<DIV>In regards to regs, I believe if you dive salt water that getting it serviced often is a good idea, in fact my LDS gives you free service on regs bought from him if you dive in salt water. I.e. when you return from the trip drop the reg off and he'll take it apart and clean it up for free, not part of the normal yearly service schedule.</DIV>
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<DIV>I think it's a good idea. For fresh water after 2 years my regs still look like new on the inside. I think it depends on how you dive and maintain the gear.</DIV>
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<DIV>I believe the maker of the reg wants to avoid liability and thus the warning about voiding warranties if you don't do the maintenance.</DIV>