I can't remember what the manual says, either 500 or 1000, but follow it religiously! I was going through hell driving nice and slow, being a good little boy back in NYC. While all these ricers and others challenge, and then laugh, cause I wouldn't do anything.
But NOW, oh it was worth it.
And I use Mobil 1 synthetic every three thousand miles. I am very happy with it. And I think if you do a search on this BB, you'll see the majority of synthetic users agree.
How'd you trash your first engine?
Good luck.