This isnt needed. If I'm not mistaken the clutches are disengaged while the brakes are applied.
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I've had my DSG GTI for about 3 1/2 weeks now. I've read (wikipedia) that you shouldn't leave it in D while waiting at a red lights, or any time with a significant wait time, for it hold the clutches on a "bite point" and heats up the trans fluid. Is this true? Do you guys do this?
Here's the source:
N position of the floor-mounted shift lever means that the transmission is in "neutral". Similar to P above, both clutch packs and all gear-sets are fully disengaged, however the parking lock is disengaged. This position should be used when the motor vehicle is stationary for a period of time, such as at red traffic lights, or waiting in a queue of stationary traffic. The DSG should not be held in any of the active gear modes while stationary using the footbrake for other than brief periods — due to the clutches being held on the bite point, as this can overheat the clutches and transmission fluid.
the clutch are barely touching in D, which is needed so that when you put your foot on the accelerator, it knows where the 'bite' point is (right at where it is in D) and start moving right away. If it completely disengages, when you put your foot on the gas, it has to increase clutch pressure ever so slightly until it feels the bite, then start engaging. This would take way too long.