Michigan Compiled Laws, Chapter 492. Installment Sales of Motor Vehicles § 492.117

Sec. 17. (a) In addition to the cost of insurance premiums and travel emergency benefits authorized in the preceding section of this act,  1 the seller of a motor vehicle under an installment sale contract may require the buyer to pay certain other costs incurred in the sale of a motor vehicle under such contract as follows:

(b) The seller of a motor vehicle under an installment sale contract may also contract with the buyer to pay, on behalf of the buyer, such other costs incidental to the sale of a motor vehicle and contracted for voluntarily by the buyer as follows:

(c) The foregoing costs may be charged, contracted for, collected or received by the seller from the buyer independently of the installment sale contract, or the seller may extend credit to the buyer for the amount of such costs and include such amount in the principal amount financed under the installment sale contract.

(d) Such other costs paid or payable by the buyer shall not exceed the amount which the seller expends or intends to expend therefor. Any such costs which the seller has collected from the buyer, or which have been included in the buyer's obligation under the installment sale contract which are not disbursed by the seller, as contemplated, shall be immediately refunded or credited to the buyer.