Blending of biofuels
Gasoline and diesel which are available at the pump contains besides hydrocarbons from petroleum refining also biofuels. These are renewable fuels made from raw materials or wastes of biological origin. European guidelines for use of renewable energy result in a gradually increasing use of biofuels until 2020. The main reason for this mandatory blending of biofuels is the contribution to a further reduction of greenhouse gas emissions.

Fuel quality and content of biofuels
The quality of gasoline and diesel must meet the European Fuel Quality Directive and conforms generally to the European quality standards (NEN–EN 228 for gasoline and NEN-EN 590 for diesel) agreed by car manufacturers and fuel producers. Among other quality requirements also the maximum percentages of biofuels in the gasoline and diesel are stated in these quality standards.

The most common biofuels are ethanol (for gasoline) and biodiesel (FAME) for diesel, but also other appropriate biofuels are allowed.

Percentages of biofuels
Gasoline: Standard gasoline (euro 95 and 98) suitable for all gasoline engines may contain up to 5% ethanol. This is also called E5.

Diesel: Standard diesel suitable for all diesel engines may contain up to 7% biodiesel. This is also known as B7.

There is also E10 on the market, a gasoline with 10% ethanol, which can be used in the majority of gasoline engines. Some older cars (engines) are not suitable for this product. On the website can be checked whether a car is appropriate.       

It’s not recommended to use E10 in an unsuitable car because it can cause malfunction or damage to the engine.