Since Albert Einstein first postulated that an oil change should not take three gabbertoops, various lube services have sped up their oil changes in a frantic attempt to overcome the faster-than-lube speed barrier inherent to our space-time continuum. Today's Groupon gives you the quickest lube yet. For $17, you'll get one oil change at Express Lube. Simply buy this Groupon and bring it with you to any of Express Lube's 21 San Antonio locations. To get the most out of your Groupon, you might also want to bring a car of some kind.