New top end sound getting louder
 

I need your expert advice please.
When I start my S2 I am now getting a strange top-end noise from around the cylinder head towards No.4 cylinder.
It started by making a tinkle noise then a rattle and now it is making a clack.....clack.....clack.....clack.....clack..... clack.....clack.....noise.

It is getting louder every time I start the car.
Do you think it could be the camshaft tensioner (kettenspanner 944 105 049 01)

I do not want to run the engine too long in case it is causing damage, but I am asking myself if it is not the
hydraulic tappets due to low oil pressure because the car has been standing.

What do you think?

Many thanks,
Philippe

Pull the valve cover and take a hard look! Might be the tensioner. Might be a loose cam bearing block. Might be a broken cam.