Compared to natural gas

In contrast to natural gas, biodiesel can be used on the same motors as conventional diesel.

Land use

Planting rape may be a reasonable alternative to make use of fallow land.

The production of biodiesel is very expensive and can currently only subsist with subventions.

Infrastructure

Biodiesel would require a parallel supply infrastructure (at least during parallel use with conventional diesel).

Wear

Due to its chemical properties, RME increases motor wear (especially on gaskets etc.). In many cases RME resistant motor components are required.

Lubricant dilution

Combustion temperature has to be carefully controlled, since low temperature may lead to the dilution of oil lubricant.

Smell

The exhaust of biodiesel has an unpleasant smell (similar to french fries!).

Storage

Being a natural product, biodiesel can be affected and destroyed by bacteria infestation. This may be a problem for fuel storage.

Legislation

CD (Czech Railways) carried out tests, but legislation prevents introduction into fleet.

Environmental balance

Cultivation of rape implies the use of toxic substances like pesticides and extensive area consumption.