625 ILCS 40/3-4
The owner of any snowmobile shall within 15 days notify the Department if such snowmobile is destroyed or abandoned, or is sold or transferred either wholly or in part to another person or persons. In all such cases, the notice shall be accompanied by a surrender of the certificate of number. When the surrender of the certificate is by reason of the snowmobile being destroyed or abandoned, the Department shall cancel the certificate and enter such fact in its records. The Department shall be notified in writing of any change of address. Should the owner desire a new certificate of number, showing the new address, he shall surrender his old certificate and notify the Department of the new address, remitting one dollar to cover the issuance of a new certificate of number. If the surrender is by reason of a sale or transfer either wholly or in part to another person or persons, the owner surrendering the certificate shall state to the Department, under oath, the name of the purchaser or transferee.
625 ILCS 40/3-4