It could be a valve lifter or in the worst case a rod that is knocking.
Is the noise a click click sound or a bang bang sound?noise is a clicking sound and a rapping tapping sound related to engine speed.it seemed to happed after i put in a fuel treatment additive.


How is the oil pressure? At idle and under driving load.oil pressure is a the 3 bar when cold,2 bar at idle and 3 bar under load.just changed oil a few weeks ago.oil level is between the marker on the dipstick.visosity is 15w-40 mobil delvac