3. It shall be an unlawful practice for a dealer to sell a used motor vehicle to a consumer without giving the consumer a written warranty which shall at least have the following minimum durations:
a. If the used motor vehicle has 24,000 miles or less, the warranty shall be, at a minimum, 90 days or 3,000 miles, whichever comes first;
b. If the used motor vehicle has more than 24,000 miles but less than 60,000 miles, the warranty shall be, at a minimum, 60 days or 2,000 miles, whichever comes first; or
c. If the used motor vehicle has 60,000 miles or more, the warranty shall be, at a minimum, 30 days or 1,000 miles, whichever comes first, except that a consumer may waive his right to a warranty as provided under section 7 of this act.