I average about 10,000km/year. I would say that I do average at least 1 good 20-30 minute drive a week to properly warm up the car and the oil.
I'm about to change the oil at around 15500km now with Honda FEO (SL)... but will consider something like ELF Exellium from 20,000 or 30,000km for 10,000km intervals.
My CRV is about to get it's 40,000km service and the last oil change was 31,000 about a year ago.
The reason for the 6 month service intervals is because the engine oil is also used to drive the i-VTEC mechanism. The oil may still be good for the engine, but if there is any sludging, that could jam or deposit in the VTC or VTEC oil channel components.
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