I do two oil filters per one oil change, oil filter every 5000 km, oil every 10 000 km(castrol syn 5w30). It actually takes me close to two years to do 10 000 km, not short trips. I have had the oil analysed at the 10 000 km mark and the report was that it was still in good condition, so please no sermons about having to replace it sooner.
The engine is the buick 3.6L v6 (HFV6) as adapted for use here in Australia and changing the oil filter/cartridge is child's play(as well as assessing the condition of the filter), there is a canister that sits on top of the motor and unbolting the top allows the cartridge(AC088)$10 to be replaced in a matter of seconds without spilling a drop of oil.
Why do I replace the filter twice as often. It may not be necessary, but whenever changing it , I noticed that the filter did have some build up of gunk on it and that avoiding the issue of the filter becoming blocked and the oil then bypassing the filter was something that could be cheaply and easily avoided, at the most I have spent another $10 and wasted a minute of my time.