REG Ultra Clean® blends biodiesel and renewable diesel to create one of the lowest-carbon liquid fuels available. Our proprietary combination delivers biodiesel’s excellent lubricity and renewable diesel’s high Cetane and low Cloud Point
in a 100% renewable fuel. REG Ultra Clean reduces carbon emissions enough to be an approved fuel by the California Air Resources Board (CARB), one of the most stringent clean air standards in the
Blending biodiesel with renewable diesel to create REG Ultra Clean gives users the best properties of each fuel. That makes a big difference with sustainability. Compared to petroleum diesel, REG Ultra Clean reduces total hydrocarbons by
more than 20 percent, particulate matter emissions by more than 40 percent, carbon monoxide emissions by more than 25 percent and nitrogen oxide emissions by 10 percent.