Michigan Compiled Laws, Chapter 257. Motor Vehicles § 257.1253

Sec. 13. (1) A person shall not sell or offer for sale in this state a warranted product unless the vehicle protection product warranty clearly states any terms and conditions governing the cancellation of the sale and warranty.

(2) A warrantor may only cancel a warranty if the warranty holder does any of the following:

(3) A warrantor canceling a warranty shall mail written notice of cancellation to the warranty holder at the last address of the warranty holder in the warrantor's records at least 30 days before the effective date of a cancellation. The notice shall state the effective date of the cancellation and the reason for the cancellation.