Today’s EN 590 10ppm diesel is the product of three decades of steady tightening. Each revision of the standard tracked a step-change in European emission regulation — and the headline story is the near-total removal of sulphur from road diesel. Here is how the specification evolved.
Where the standard comes from
European diesel quality is defined by EN 590, published by the European Committee for Standardization. Although the specification itself is voluntary, it is observed by every fuel supplier in Europe, and several of its properties — cetane, sulphur and biodiesel content — became subject to binding EU directives from the late 1990s onward.
The revisions that mattered
- EN 590:1993 — the first EU diesel specification. Sulphur limit 0.2% (2,000 ppm), cetane number 49. Sometimes called Euro 1 diesel.
- EN 590:1996 — sulphur cut to 500 ppm; cetane held at 49. Euro 2 diesel.
- EN 590:1999 — sulphur down to 350 ppm and cetane raised to 51, under Directive 98/70/EC. Euro 3 diesel.
- EN 590:2004 — the decisive step: 50 ppm (Euro 4) and then 10 ppm (Euro 5) sulphur under Directive 2003/17/EC, with a 5% FAME allowance introduced.
- EN 590:2009 — FAME raised to 7%, and the 10 ppm ultra-low-sulphur limit extended toward non-road fuels.
In a little over fifteen years, sulphur in road diesel fell from 2,000 ppm to 10 ppm — a 200-fold reduction. That is what made modern after-treatment — catalytic converters and particulate filters — viable in the first place.
A note on “gas oil”
In European regulatory language, “gas oil” is the broad family of middle-distillate fuels; diesel is a sub-category of gas oil used in self-propelling vehicles. In many member states the same EN 590 fuel is used off-road for stationary and non-road machinery, distinguished only by a marker or dye for taxation. This is why you will see EN 590 referred to both as “diesel” and as “gasoil” — chemically it is the same specification.
Beyond conventional diesel: EN 15940
A newer standard, EN 15940, covers paraffinic diesel fuels — including HVO (hydrotreated vegetable oil) and GTL (gas-to-liquid). These are high-cetane, near-zero-aromatic fuels used as drop-in or blended alternatives where lower lifecycle emissions are the goal. EN 590 remains the workhorse road-diesel specification; EN 15940 sits alongside it for renewable and synthetic paraffinic grades.
What it means for a buyer today
When someone offers “EN 590”, the version that matters is the current 10ppm ultra-low-sulphur grade. Older, higher-sulphur diesel still trades in some markets under other names — which is exactly why the exact grade and a current certificate of quality matter more than the label. At Fuel Incorporation, EN 590 10ppm is our home specification, supplied locally and traded internationally against the contracted spec.
Fuel Incorporation Pte Ltd — diesel supply and physical commodity trading from Singapore. For enquiries, talk to the desk.
