In your climate, you could use 10w-40 dino if you don't mind changing it every 5000 miles. If you want to go longer, any 5w-40 will do the job and start better when/if it goes below freezing.
Synth oil simply isn't needed w/o a turbo, or if you're doing extended drains.
Ok, since I know people will bust my balls on this, try out the oil selector on castrol.co.uk
I'd use Pennzoil or Havoline. They work great in German engines, lots of moly.