Hi, Posted some of this on the newbie section, but thought I'd post it here too. Apologies if you've seen this twice... I've owned my VR6 for 6 months now - the car is a standard 97 R-reg with 87k on the clock, full VW history, and in pretty much mint condition. Car has always run very smoothly, except that the timing chain(s) have recently started to rattle. Seemed to happen very suddenly - over the course of a week or so. I've had the upper guide rail and tensioner replaced but the problem is still there. The rattle seems to occur at very specific engine speeds (between 1200 and 1500rpm), w