I haven't had a chance to play with the DSG, but I think the manual transmission is the best option for the TDI. The 5-speed in mine is very smooth-shifting and the car is a pleasure to drive.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL