valvetrain

Great forum, I've learned alot already, but now it's time to ask, thanks in advance for reading. I'm no VW expert but a good mechanic, working on my GF's car a 2002 Passat 1.8t (AWM) with 140k and need some advice. Car has a few issues, sludge in the pickup, already taken car of and helped...

So, when you first start my Passat, there are very audible rapid clicking sounds that come from the motor of course. My cousin says that it's the valvetrain that is making these new clicking noises. Also, when its totally warm and you take it over 3500 RPM, the valvetrain, if thats what this...

I started hearing the same loose-chain sound from under my valve cover again recently, after having been absent for a few months, so I used the screwdriver-stethoscope trick to listen to the CCT -- nope, it's plenty tight, and it has a pleasant whirring sound coming from its portion of the valve...

Just changed the oil on my 2001.5 B5.5 Vr6 with Mobil 1 10w30 as it was the only synthetic the Advanced Auto had this morning along with a K&N filter (ONLY damn filter they had for the Vr6 period). Now I've noticed an increase in valvetrain noise, lifters, etc. I haven't driven it yet, so I am...