Michigan Compiled Laws, Chapter 492. Installment Sales of Motor Vehicles § 492.130

Sec. 30. (a) Upon payment in full of the time balance and other amounts lawfully due under an installment sale contract, the holder shall, unless the buyer is otherwise indebted to the holder and has secured such debt by lien upon the motor vehicle:

(b) When the final payment on an installment sale contract is made in cash, money order or equivalent tender, by the buyer or his authorized representative, at the office of the holder, a legal discharge of this encumbrance, shall be delivered at the time of such tender of payment, if demanded by the buyer; otherwise delivery may be made at a later date in person or by mail as may be arranged between buyer and holder. All other instruments referred to in this section shall be delivered or mailed to the buyer within 25 days of the date of final payment.