Once you're a Preferred Rewards for Business member, you can get a Business Advantage auto loan interest rate discount up to 0.50%. You must be enrolled at the time of your application and your interest rate discount is based on your tier level – Gold 0.25%, Platinum 0.35% or Platinum Honors 0.50%. That means if you're a Platinum Honors tier member and qualify for a new Business Advantage auto loan with a 4.00% interest rate, a 0.50% interest rate discount would lower your interest rate to 3.50%.