i heard the vid , but on a laptop so sound not great but sounds similar to what my cars do and i have to agree with weasel which is sort of what i was thinking but didn`t know how to put into words .

i only use 93...something weird happened...i normally had used exxon..but exxon sold their outlets to gulf so i used gulf and swithched off with bp..then one day i was out and used shell and a day later noise developed..may be a coincidence or shell caused something to go wrong...rob

i need to note what fuel i`m using when my x does it`s worst cos it`s probably louder with inferior fuel .

Take your car back to the dealer and have them look at your valve again because it sound like your valve is ticking.

You do realise he has 16 valves (4 per cylinder) and that does not sould like a valve tick.