420SEL wrote: "...Does the dealer do your oil changes for free on new cars? That would be the only reason I could think of why they wouldn't change it. ..."
I don't own a MY2000 car, so I don't know for sure, but I think I remember hearing that MY2000 cars' prices INCLUDE all service up to some mileage (50K?) or time, so maybe that's why they're not willing to change your oil (at their expense). Offer to pay for the change, and see what happens.