i get my alto vxr tunned wenever it starts 2 give problems doesnt matter 1000km or 10000km! wenever u feel tht it aint running well tht means time for tuning!there is no fix period for tuning!but oil/oil filter shud be changed every 5,000km unless ur using a good quality oil such as mobil1 or shell ultra!u can use tht oil for 12,000km easily as long as u change ur oil filter after every 5,000km n use a good quality oil filter!