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What do vehicle manufacturers say?

Some manufacturers do not recommend mixtures over 5% and may even make this a prerequisite of maintaining the warranty. However, tests carried out by a number of organisations (including EVE) shows that biodiesel causes no problems besides those that might be caused by conventional diesel.

As a general rule, car manufacturers accept B5. However, an increasing number of manufacturers, such as the PSA PEUGEOT group and CITROËN accept blends of up to 30% biodiesel (B30), provided they comply with standards EN 14214 and EN 590.
As part of its commitment for 2009, Renault wants all its diesel engines to be able to run on B30.

In the case of heavy vehicles, to date manufacturers have accepted B5, but there is a general move to accept B30 and some manufacturers now even accept B100. SCANIA accepts B100 rape oil in Euro IV and V EGR and SCR engines. RENAULT Trucks accepts B30 in all Euro III and subsequent engines.

As for agricultural vehicles,  all tractors marketed under the brands Same, Lamborghini, Deutz-Fahr and Hürlimann equipped with Deutz engines can use biodiesel of up to 100% (according to standard EN 14214) without affecting reliability or compliance with current standards on exhaust emissions.
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