71. A sales contract for a used automobile or for a used motorcycle is exempt from the application of sections 37, 38, 53, 54 and 155 to 165 of the Act where:
(a) the used automobile or the used motorcycle was given in exchange to the merchant by a consumer at the time of purchase of an automobile or a motorcycle;
(b) the used automobile or the used motorcycle is sold to a consumer designated by the person who gave it in exchange; and
(c) the maximum sale price of the used automobile or of the used motorcycle corresponds to the credit granted for the exchange to the consumer by the merchant.
The exemption referred to in the first paragraph applies only to a contract containing written attestation, by the consumer who has given the used automobile or the used motorcycle in exchange to the effect that the vehicle has been sold to the consumer designated by him.
R.R.Q., 1981, c. P-40.1, r. 1, s. 71.