I'm going to try and not be an asshole here
Your best bet without a doubt is to have your home in either a HELOC, so you can just take money out whenever you want, or to secure the loan.
The reason is because the loan is secured, you will be paying far less % on the home itself.
Standard car loan rates at banks are usually pretty bad, sometimes 8 or 9%. If you were to get a secured loan variable over 5 years you'd be looking at 3%
Another strategy is to use your home equity to buy into dividend paying securities, and use the dividends to pay for the car or the lease (if you don't have your own business).
That way you can deduct the interest expense against any investment income and use the dividends to pay for your car. Up to you though.