I inspect my regulators frequenly, clean them thoroughly after each salt water trip, and service my own regs when there is a problem. I'm getting 3 years or more between a full "annual service" or at least 100 dives. Mfgrs are safesiding their service recommendation while also helping the dive shops with service business. But if you do a poor job caring for myour regs, then an annual service is probably not enough.
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<DIV></DIV>I remember when recommended oil change interval was 1500 to 2000 miles. Back then, I believe regs were serviced annually. Do you think oil improved but regulator parts (seats and o-rings) did not?