Kia Cerato Engine Problems

It seems that Kia has changed from hydraulic to mechanical lash adjusters, which is the reason for the noise. They told us the change was made for better reliability and service life, and lower cost of servicing.

You need to have a mechanic observe the vibration first-hand and he might be able to diagnose it for you. It's impossible to diagnose without observing it. If you're really concerned about it take it back to the dealership where you bought it and try again to have them assess it for you.