Here is caveat about no payment for x months, don't forget that!!!
Don't believe me? Go ahead read the damn fine print, hope your eyes can see tiny fonts, otherwise get damn magnify glass and see for yourself. Not understand the language, ASK somebody else to translate for you.
Supposed you were able to pay off within 6 months, sure no interest charges on you, BUT, I mean seriously BUT if you failed to pay within 6 months, you will be charged interest from the day 1 that you took out the loan! So with automobile loan, I don't see how this is possible for average buyers, unless they refinance their auto loan WITHIN 6 months. Used car dealer technically can do that, but government could view this as shark loans and can consider them illegal so likely it won't happen.