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Of course, the real question is, do you trust the computer algorithm? Some people say that once you add oil from the bottle, even if you're not driving it, the oil oxidizes. In a calendar year, the oil and/or additive pack has degraded. This is why oil labels say 1 year. This is why the computer will signal you in 1 year. Some people believe that the oil they are using will not have that problem. A lot of people feel that certain higher prices motor oils are better and will not degrade. You can send in an oil sample for analysis. I usually buy motor oil based on what I can buy cheap. And I have gone over 1 year between oil changes. The car did not blow up while driving on old oil. But that doesn't mean I did the right thing. I can't measure if the old oil was oxidized, or if any damage was done.

@herb - easy solution to turning off that message, which is in the User's Manual (shown below). Another forumite posted this procedure a few months back but not sure what thread. Worked for me. The one year clock gets set in my van before I get to the 5,000 mile interval for an oil change. Just hitting 20,000 now so I'm ready for another service too.