You'd also need to know the interest rate, the amount of the monthly payments, and how long you'll have to pay off the loan. The shorter period of time for the loan, the less you'll pay in interest, but the monthly payments will be higher.

What factors are the most important when considering a loan for purchasing a new car?

For starters i know that its the individiual credit if one has good credit they don't have to pay as high interest rates if one has bad credit the interest are very high.

I don't know what else would be important?