There is a Caveat to the oil "monitor." It does not actually monitor the oil itself, so it is possible to trick it. The monitor works by counting the mileage and weighting it against operating parameters. The primary parameter it measures, after mileage, is wheather the engine is in open loop or closed loop. If the engine were to spend the majority of it's time in closed loop, it will take you to the max interval. Each mile in open loop will send you toward a minimum, and if it is 100% open loop, you would not make it to 3k.
The main thing that will fool it into giving you too long of an interval is dusty conditions. It has no way of monitoring for oil contaminents.
That is one thing I look forward to in the Bosch oil monitor, which actually monitors the oil, not the conditions.
As has been said above, the monitor is set up for an oil meeting the minimum requirements for the engine. This would be an SG 5W30 in the case of my car. So any better oil will go further than the monitor indicates.