
Originally Posted by
dArK5HaD0w
the 7 speed dsg is sealed for life, so it requires no oil change. hence "dry".
the 6 speed dsg requires an oil change. hence "wet".
On the 6 speed, the clutches sit in an oil bath. This is why it is called "wet" (same as a motorbike except for airhead BMWs & a few other odd fish - Ural, maybe Moto Guzzi). This oil is shared with the mechatronics / gears / bearings etc. The clutch material contaminates the oil & the heat of the clutches degrades the oil.
On the 7 speed, the oil is confined to the mechatronics / gears / bearings. The clutches run in free air like most conventional automotive clutches, ie: they run dry. Because the oil isn't getting heat degraded & full of clutch material, it lasts a lot longer. VW call them a "sealed for life" unit but there must be a way of changing them. It's the oil causing corrosion in the mechatronics in the 7 speed that has supposedly caused the current recall so they must be changing out the oil when they do the mechatronics change.
Keep in mind that VW aren't too concerned about longevity of components beyond what most companies would keep a vehicle for. They are purposely trying to reduce the TCO in the initial stages of ownership at the expense of long term ownership.
Ford tried something similar in the Falcon (took out the dipstick & said it was sealed for life & no service regime required) and it was a bit of a disaster.
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