What effect will Bio-diesel have on vehicle warranty?
None, so long as the blended fuel used complies with European Standard EN 590. According to the UK Department for Transport: “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, DAF Maniacal and Mercedes all approve Bio-diesel blends for use in their vehicles. This is based on UK Department the Diesel Fuel injection Equipment Manufacturers (DFIEM) whose members include Delhi, Bosh, Siemens VDO, Denso and Stanadyne.