Hi Ti-Cat,
I have an 03 ZX5 and I drove it 'firmly'(Comment here Saffi, I know you want to...) for the first 5000 kms with an oil change at that point. I use the semi 5w20 that Ford specs the car with and Mobil1 in the winter. The car settled in quite nicely. Incidentally, wait and see what a difference new tires make if you're running the factory Firehawks or Pirellis. I will be putting some FAlken 512s on next year after trying them out in my friend's ZX3. WOW! I hope you enjoy the car.