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BMW have had their issues with DCT, stalling and zero drive being the most dangerous. Nissan have their own concerns with reliability but without knowing what the owner was doing with the car it's impossible to say that it's totally Nissan's fault, the only thing we are sure of is that the Nissan is putting an extra 100~120hp more through it's transmission than BMW are and it's got awd which will also put more stress on the transmission. The only other car that has DCT, awd and more power than the M3 is the Bugatti and it's gearbox costs £160K to replace so one might expect it's extremely over engineered in comparison.
The only DCT I think that will have less problems than the others will be the PDK from Porsche. They sledom get too many things wrong....... well with the possible exception being the controls.
P.S.
I was told by the service manager that there was definitely different versions of software on the DCT cars, that is why the upgrade could take anything from 3~6 hours to complete.
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