After we read the positive customer testimonials on your website, we bought at 82 Diesel Mercedes as a "test car" to see if the Greasecar kit would actually work. It did - and a few weeks later we found a 99 Diesel Mercedes for a great price. Although Nick had installed the Greasecar kit himself on the older car, we didn't want to mess around with the newer car, so we had Dave Dunham of Smarter Fuel convert the car for us. In the beginning, we collected grease ourselves from restaurants, but it was too messy and time-consuming. Now, we buy clean vegetable oil from Smarter Fuel, which gets delivered to Nick's work about once every 3-4 months in a 270-gallon tote that has a tap on it. We fill up barrels with the oil and, using a hand pump, pipe it into the 10 gallon tank in our trunk. We love our his?-and-her?s Greasecars and plan to keep them forever - for our three-year-old's 16th birthday, if possible!