Any lender (whether associated with an auto manufacturer or not) is required to disclose (in plain English) certain terms of a loan. For example, any lender must show the amount you are financing, any charges associated with obtaining the financing, the interest rate, how much interest you will pay, and what the total cost of buying the car will be (i.e. principal + fees + interest). If a dealer's finance company, or someone at the dealer (or your own bank for that matter), does not comply with these requirements, they, and the lender itself, could get into some very serious trouble.
That being said, it just depends on which lender is better. If the dealer is doing 0% for up to 60 months if you finance through their lender, I doubt that your bank will be able to beat that. The best time to use dealer financing is usually when they are running APR specials on financing (e.g. 0%, 0.9%, etc. for up to X months). If it is effectively "non-promo" financing, your bank or credit union or other lender will likely be able to better compete with the dealer financing.
The best thing you can do is find out what terms you could get through your bank, credit union, etc. and then compare those to the terms you can get with dealer financing. Then decide which loan package is best for you.
If there is anything that does not make sense, seems out of the ordinary, or that you simply want further clarification on (whether at the dealer's lender or your bank) ask about it. They should be willing to explain it as many times, and in as many different ways as necessary, until you are comfortable and satisfied with their answer.
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