If you listen to any Dealer, it's as lolmclol says, 10,000km OR 6 months, which ever comes first. However, it also depends on what was done at 1000km. Normally, the 1000km is just a check up, to make sure nothing falls off. The normal 10,000 km service would include an oil change, for which 3 months is a short period. Either way, it's up to you, you could service it once a year, so long as it's at 10,000 km intervals and they would still honor your warranty.