Purchase 5 Valvoline quarts and qualify for (up to a) $12 mail-in rebate. The rebate is not to exceed the purchase price of your 5 quarts. I think it costs around $2 for each quart of Valvoline, so you can get 5 quarts for around $10 then get a rebate back for $10. If your 5 quarts cost more than $12, the rebate will give you $12 back. Here is the link

http://www.valvoline.com/pages/rebates/rebate_details.asp?rebateid=9