You really should consider basing your oil choice on compliance with the applicable VW standards in order to preserve your warranty protection.
VW502.00, 503.00, and 505.00 are usually the benchmark.
Especially important for turbo and W engines.
My W8 will be getting either Motul 8100 E-Tech or Elf Excellium LDX when it gets it next oil change - and from then on.
I'm way out of warranty and Rotella T is mighty tempting as its easily available for me. IIRC our resident tribologist AA gave a :thumbup: for Rotella T at one time (and she rarely gets involved in oil threads ...).