Background

The quality of European diesel fuels is specified by the EN 590 standard. While these specifications are not mandatory, they are observed by all fuel suppliers in Europe. Beginning from the late 1990s, several diesel fuel properties—including cetane number, sulfur content and FAME biodiesel content—are also subject to environmental regulations.

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Some of the important revisions of the EN 590 standard were:

  • EN 590:1993—The first EU diesel fuel specification. It established a sulfur limit of 0.2% in onroad and nonroad diesel fuels.
  • EN 590:1999—This standard reflected the sulfur (350 ppm) and cetane (51) specifications by Directive 98/70/EC.
  • EN 590:2004—Sulfur limits of 50 ppm (so called Euro 4) and 10 ppm (Euro 5) as regulated by Directive 2003/17/EC. FAME content of 5%.
  • EN 590:2009—FAME content of 7% as regulated by Directive 2009/30/EC. This directive also adopts mandatory biofuel requirements for refiners and introduces a 10 ppm S limit in nonroad fuels effective 2011.

Regulatory Terms. In the EU regulatory language, “gas oil” is the term used to describe a wide class of fuels, including diesel fuels for onroad vehicles, fuels for nonroad vehicles, as well as other distillate fuels. Within the gas oil classification, fuels for onroad vehicles (typically with sulfur content below 0.05%) are referred to as “diesel fuels”, while fuels for nonroad mobile machinery (typically with sulfur content up to 0.2%) are referred to as “gas oils intended for use by non-road mobile machinery (including inland waterway vessels), agricultural and forestry tractors, and recreational craft”.

These terms are also linked to the terminology used in the EU Common Customs Tariff. Different goods are assigned unique CN (Combined Nomenclature) codes to identify the tariffs that apply. Diesel fuel for onroad applications has a CN code of 2710 19 41. Gas oils for nonroad mobile machinery can have a CN code of either 2710 19 41 or 2710 19 45 depending on sulfur level.

EN 590:1993 Specification

The EN 590:1993 included a sulfur limit of 0.2% (wt.), which became effective from October 1994 [Directive 93/12/EEC]. This sulfur limit was applicable to all gas oils, including diesel fuel. Details on the EN 590:1993 specification are listed in Table 1.

Table 1
EN 590:1993 Diesel Fuel Specification
Fuel Property Unit Specification Test
Min Max
Cetane Number   49 - ISO 5165
Cetane Index   46 - ISO 4264
Density @15°C kg/m3 820 860 ISO 3675/ASTM D4052
Sulfur % (wt.) - 0.20 EN 24260/ISO 8754
Flash Point °C 55 - ISO 2719
Carbon residue (10% btms) % (wt.) - 0.30a ISO 10370
Ash % (wt.) - 0.01 EN 26245
Water content mg/kg - 200 ASTM D1744
Copper strip corrosion, 3h @50°C   - Class 1 ISO 2160
Oxidation stability g/m3 - 25 ASTM D2247
Viscosity @40°C mm2/s 2.00 4.50 ISO 3104
Distillation (vol. % recovered) °C     ISO 3405
  10% point report
  50% point report
  65% point 250 -
  85% point - 350
  95% point - 370
a - limit does not apply if ignition improver additives are used.