Some dealers are great --aboveboard and ethical, and they will give you their best rate. Others, alas, are not.
One great piece of advice that I've read here is to print out your FICO scores, including the reports. Just hit "printable version", and it will all be there. Take this with you when you are ready to make a deal. Your scores might be a bit different from what they pull, as they might use an "auto-enhanced" FICO score that gives extra weight to any car loan history you might have, and also there are those semi-random wanderings up and down of your scores that you already know about. Unless you pull your scores that very day, there is always that possiblity.
Anyway, take your scores with you. If any lender --dealer or otherwise --tries to convince you that your scores are way below where you know they are, you can show them your print-outs. Again, they might well not match identically, but they ought to be in the ballpark, unless you have some sort of horrible car loan messes in the past.
And again, I really don't believe that some 30 days that occurred 4 years ago will be a factor. You might be ready to explain the circumstances, but if they look down their noses and try to manipulate, I would tell them that I was taking my business elsewhere. And you might want to let the general manager know as well.

edit: By the way, you said you have your accounts with a bank. Definitely speak with them, but also check out credit unions. CU's are often a great source of auto loans.
edit again: Also also, if you haven't visited the Mortgages and Loans board, you might check it out as well. I do think you're going to be fine. Despite what you read about the average score being 720 or something, I think yours are a lot better than many that they see. If they want to sell you a car, they'll find a way to do business with you. Do your research first to find out what a reasonable price should be for what you're looking at. (For that info, I am definitely the wrong person to ask. It might be on cars dot com or carmax or something.)
Message Edited by haulingthescoreup on
01-28-2008 12:20 PM
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007