I have a 2013 Passat, 6sp manual transmission. 95,000 miles. The other day the weather was glorious in Ohio so I rolled down my window. It was then I heard a ticking noise. The noise almost had the same frequency as the valve train. With the clutch out the noise is present. When I push in the clutch the noise goes away. The noise is there when the clutch is out when in gear or neutral. It sounds like an exhaust leak or a leaky valve, like a tick tick tick but I suppose there's some kind of internal problem of the transmission. There are no vibrations. No change in the feel of either pressing in the clutch or changing gears. I'll take some insight. Tomorrow I'm going to take it to the dealership and get their thoughts.