The National Biodiesel Board states that biodiesel blends of 20% (B20) and below will work in any diesel engine without needing modifications, and that the blends will work just like petroleum diesel. The NBB also recommends the following precautions: For a list of retail locations to buy biodiesel, vist http://www.biodiesel.org/buyingbiodiesel/retailfuelingsites/default.shtm.