Biodiesel is usually made with vegetable oils, such as soybean oil, or animal fats.
In the U.S., biodiesel can be subsidized up to $300 per tonne, and some companies are taking advantage of that subsidy by shipping tankers full of foreign biodiesel to the States and adding a small amount, or a "splash," of U.S. diesel.
Adding that splash means the entire shipment can qualify for the subsidy. The tanker then usually takes that newly subsidized biodiesel and "dashes" off to Europe, one of the largest markets for the alternative fuel.
Some European companies are also said to have shipped biodiesel to the U.S. to take advantage of the payout, with the biodiesel then sent right back to Europe. That version of splash and dash is called the "U-boat" trade.
Link
http://media.cleantech.com/2915/the-splash-and-dash-smackdownI really do not like subsidizing fuel oil for Europe.