I used Mobile One Synth 15/50 in my VR6 Passat for about 85k until I sold it at 100k miles, and the engine ran like a top until the day I sold it...it was just everything else on that stupid car that fell apart. (water pump, water neck, thermo, coil pack, motor mounts, window regulator, clutch, welding on clutch pedal failing, door handles, door latches, cat converter, 02 sensor, a/c, etc etc)
Just saying, textbook oil for that car was like 5/30 or 10/30 or something.