in Australia most of the V6 and Over cars now come with 15000 Km service intervals,
I on the other hand always change at 7500 km
people with turbo's and super chargers change at 5000 mostly.
you can use full synthetic oils for 15000K intervals but still that is pushing the limit a bit and paying top dollor.
In Pakistan how ever due to alot of dust and polution i think oil change interval is much more earlier speciall for small cars.