I'm tempted to buy some QS synthetic because of the $10 rebate but in my experience, rebate checks often never come even if you fill them out exactly as they ask. In general I get my rebate maybe only 50% of the time. I'm still waiting for two printer rebates from many years ago. What a scam. I think they're just a way for the companies to get your mailing address so they can sell it to marketers. Has anyone had a 100% success rate getting their rebate checks?