My 2005.5 2.0t fsi audi quattro is due next week for the first service at 5k. The dealer will use Syntec 5w-40 or if I pay an extra $30 they will use M1 0w-40. My daily commute is 25 miles down hill to Denver (elevation 5280 ft.) at highway speeds. During the day I usually put about 10 miles in city traffic. Then 25 miles up to my house at 8000 ft. elevation. The last 5 miles the turbo is spinning hard to get the car up the hill. I'm trying to stick with one brand for as long as I own the car. After this first service dealer only pays for 10k oil change intervals. Your thoughts?