Hi. Can anyone help me with this noise from the engine? It's coming from the top of the engine. It is most prominent in the last cylinder area. But I can hear it throughout all the cylinders. The sound is rhythmic and increases with RPM. Its on C30 2009 2.4i 220000 km. Here is video of that. The tick was there for almost 2 years. It got louder with time. If anyone can help me point the problem, that would be great. Thanks.