On my Service history booklet, where the mechanic signs for the service or oil change date, at 40,000 km says service, then it continues with service every 10,000km. (50,000 , 60,000 and so on) Before it was an alternate service 10,000km, then next 10,000km it was oil change and so on. Why from 50,000km does the oil change disappear? and we only get service interval every 10,000km ? Thanks.