I talked to the service mechanic at my dealer, which I trust as it is a small, mom & pop shop I've been patronizing for quite a while, and he said as long as I don't go too far over 1,000 it won't be a problem. You should be fine as long as you're taking it easy and aren't getting it too hot between now and then. Of course, oil is relatively inexpensive compared to invalidating the warranty so I'd make sure and change it out before 1,000 just to be safe.
Just my 2c