Keep in mind if you're buying a used 2007 Toyota Camry that the oil burning problem was a Toyota Service Bulletin and not a recall. The TSB has expired. If the previous owner(s) did t do it in time, you can't do it for free anymore. You might need to "top up" half a quart of engine oil or do oil changes every three thousand to five thousand miles even with full synthetic oil, ignoring any Toyota assurances that you may wait longer.