Seat
Until mid-2004, the Volkswagen Group warranted its diesel engines to run on biodiesel (from an accredited source and conforming to the DIN 51606 standard), but concerns over the sensitivity of the latest-generation Pumpe-Duse and piezo-injection fuel injection systems and the quality of the biodiesel fuels available have resulted in a change of policy. It now only warrants its diesel engines for a 5 percent blend. Owners of older VW Group diesels may find their cars can run on biodiesel - but must call their relevant customer services department and quote an engine code to check this for certain.
Skoda
Until mid-2004, the Volkswagen Group warranted its diesel engines to run on biodiesel (from an accredited source and conforming to the DIN 51606 standard), but concerns over the sensitivity of the latest-generation Pumpe-Duse and piezo-injection fuel injection systems and the quality of the biodiesel fuels available have resulted in a change of policy. It now only warrants its diesel engines for a 5 percent blend. Owners of older VW Group diesels may find their cars can run on biodiesel - but must call their relevant customer services department and quote an engine code to check this for certain.
Suzuki
No information available as yet - consult Customer Services and quote engine number.
Toyota
Toyota does not recommend the use of biodiesel or RME, either in pure form or in a blend, claiming that it affects engine reliability - especially the fuel pressure pump. Any engine damage caused by the use of biodiesel would not be covered under warranty.
Vauxhall
Vauxhall/Opel does not recommend the use of biodiesel/RME without modifications to the standard engine; use of such fuels will invalidate a warranty.
Volkswagen
Until mid-2004, the Volkswagen Group warranted its diesel engines to run on biodiesel (from an accredited source and conforming to the DIN 51606 standard), but concerns over the sensitivity of the latest-generation Pumpe-Duse and piezo-injection fuel injection systems and the quality of the biodiesel fuels available have resulted in a change of policy. It now only warrants its diesel engines for a 5 percent blend. Owners of older VW Group diesels may find their cars can run on biodiesel - but must call their relevant customer services department and quote an engine code to check this for certain.
Volvo
The current range of diesel engines, including the latest D5 diesels, are only warranted for a 5% blend of biodiesel/RME, but some of the recently discontinued diesel units fitted in the larger models are fully biodiesel-compatible. However, Volvo stresses that you should ring its Customer Services and check your engine code before using any alternative fuels, as by no means all these engines are suitable for biofuel use.
http://www.channel4.com/4car/buying-...ofuels-10.html


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