Can you describe the sound and the circumstances when you heard it a little better?
Not saying this is exactly what you are hearing but the high pressure pump is loud normally and even louder with the engine cover off. GDIs whether it is Kia, VW or Ford along with most others are quite noisy. Some manufacturers just sound deaden the car a little better to muffle the noise.Today I was driving with my radio off for first time and I heard a weird sound ( sounds like valves to me) Anybody has the same situation?
Not a problem and it runs smoother and sounds quieter but at the same time there is going to be a ever so slight loss to performance with the heavier weight oil. Check the owners manual, it pretty much says anything other than driving like grandma is severe duty with 3000 mile change intervals and recommended oil to use.Not to hijack the thread for oil questions, but you don't have any problems with running 5w40?