My new kia rio 1.4 ex petrol engine has annoying ticking noise at start up from cold. Had to the dealers twice, but they cannot figure out what it is. (in other words they don't want to fix. I was wondering what engine oil to put into it, as it has 2000km done, and thought a thicker oil or different oil might get rid of it. Does some one know what oil goes into this motor, and would it solve the problem. Christchurch New Zealand