None, so long as the blended fuel used complies with European Standard EN 590. According to the UK Department for Transport in this blend: “It can be used just like ordinary diesel in all private and commercial vehicles – without adaptation and under vehicle warranty
The main commercial vehicle manufacturers such as Volvo, MAN, Ford, Scania & Mercedes all approve biodiesel blends for use in their vehicles. This is based on the stance of the Diesel Fuel Injection Equipment Manufacturers (DFIEM) whose members include Delphi, Bosh, Siemens VDO, Denso and Stanadyne. In June 2004 DFIEM members issued a statement declaring support for the use of the B5 blend (5 per cent biodiesel to 95 per cent mineral diesel). In order to honour warranties, they insist that fuels must meet the quality standards laid down in EN 14214 and EN 590.” The level of inclusion is likely to increase to 10 per cent over the next few years.