Michigan Compiled Laws, Chapter 570. Liens § 570.304

Sec. 4. (1) A garage keeper's lien under section 3  1 shall not include an amount for labor and materials for any of the following if the materials used were custom materials that are not normally available from the manufacturer or, in the case of a vehicle manufactured in a foreign country, a distributor of the vehicle or that are not normally installed on the vehicle by the original manufacturer:

(2) Unless otherwise agreed to in writing, a garage keeper's lien under section 3 may include an amount of not more than $10.00 per day for the storage of the vehicle, for the storage of an accessory used in the operation of a vehicle, or for the storage of accessories and supplies furnished for the vehicle or an accessory used in the operation of the vehicle. Unless otherwise agreed to in writing, the charge shall be for not more than 120 days' storage.However, a lienholder who pays a garage keeper's lien under section 5(8) is not liable for and is not required to pay for any storage charges that accrued prior to 45 days after the garage keeper's notification to the lienholder under section 5. Charges described in this subsection may be in addition to the maximum allowance under section 3(4).