All good suggestions made so far. With only a 3-quart sump, I'd be nervous about going 8,000 miles unless it was all highway miles.
Having said that, as others have stated, getting a Used Oil Analysis done will definitely help determine if 8k is too much for your oil. If it were me, I'd do a pull @ 6k miles, and see how it is.. and go from there.
I would also like to add that you should also make sure your air filter is in good shape. If it's got a hole, or is not filtering well enough, or is not in there right (and thus letting stuff by), your oil is definitely not going to look good.