If you're not confident you can resist using the money at
least
until you can easily pay back the remainder, don't do it.
Also if you use the money, it's not in the account collecting interest, which defeats the whole purpose.
This is a good point.
I originally looked at the offer because I thought buying a car on an interest-free loan is better than a regular car loan, but then I realised...wait, this could actually make me money.