The big pre-2009 issues seem to be resolved. Not just the IMS, the poster child, but many, many aspects of the motor are improved:
block integrity, oiling, rods and bearings, IMS, etc.
I dont know of any issues with the PDK transmissions, although i suspect that like any such box, servicing it more frequently than suggested is not abad idea. Case in point, on the ZF supplied tiptronics in 2002-2003 audi S6s and similar high torque cars, Audi says the ATF is lifetime. ZF, on the other hand, says 50k km; and it makes a significant difference in operation and life. Maybe the "lifetime" part is a self fulfilling prophecy.
Of course, yours has more traditional gear oil, but even then i'd consider service before the manual indicates - certainly around 50-60k miles depending on the type of service it receives.
Change the oil frequently on infrequently used cars (20k miles/8 years is infrequently used). Read a post i wrote days ago for why.
Grant
Grant
gee-lenahan-at-gee-mail-dot-com