One of my vehicles is a Hyundai Grand i10 ,still under maintenance contract .Dealer requires servicing at 1 year or 15000km intervals .Car has done 9000km since the last service in March 2017,using Castrol Edge 5w30 .My query relates to the noise of the engine and color of the oil after such little use ,surely the oil can go way longer than this ? The noise is a hyd lifter type tick that goes away when the oil is changed .Any views on the oil or interval ?